Patent Publication Number: US-2021188333-A1

Title: Vehicle Monitoring System

Description:
BACKGROUND 
     Technical Field 
     The subject matter described herein relates to systems and methods that monitor movements of vehicle systems. 
     Discussion of Art. 
     Vehicle control systems can control movements of vehicle systems formed from one or more vehicles based on operator input and external factors. These external factors can include speed limits, obstructions on a route, capabilities of the vehicle systems, or the like. 
     An additional factor that may dictate how a vehicle system moves is the presence and/or movement of other vehicle systems. For example, a first vehicle system may need to coordinate movement of the first vehicle system with the location and/or movement of a second vehicle system. This can occur when these vehicle systems need to coordinate a meet-and-pass event, a meet-and-overtake event, or the like. The first vehicle system may not be able to pass or overtake the second vehicle system on a first route until the second vehicle system is moved onto a second route, such as a siding. As another example, the first vehicle system may not be able to enter into a segment of a route until the second vehicle system moves out of that segment of the route. 
     The locations and/or movements of other vehicle systems may be manually monitored by an operator onboard a vehicle system. Optionally, these locations and/or movements of the other vehicle systems can be monitored by computerized monitoring systems. These monitoring systems can have a limited capabilities. For example, the distance or range over which the other vehicle systems can be tracked may be limited, the information available to these monitoring systems can be limited, and the like. 
     BRIEF DESCRIPTION 
     In one embodiment, a method includes receiving a selection of at least one vehicle-of-interest onboard a vehicle system moving along one or more routes in a transportation network. The at least one vehicle-of-interest is disposed on the one or more routes in the transportation network. The method also includes monitoring one or more locations of the at least one vehicle-of-interest from onboard the vehicle system, displaying the one or more locations of the at least one vehicle-of-interest on a display device disposed onboard the vehicle system, and determining whether to change display of the one or more locations of the at least one vehicle-of-interest on the display device based on an update to a notified state of the at least one vehicle-of-interest being received onboard the vehicle system. 
     In one embodiment, a system includes one or more processors configured to determine at least one vehicle-of-interest onboard a vehicle system moving along one or more routes in a transportation network. The at least one vehicle-of-interest is disposed on the one or more routes in the transportation network. The one or more processors are configured to monitor one or more locations of the at least one vehicle-of-interest from onboard the vehicle system and to direct display of the one or more locations of the at least one vehicle-of-interest on a display device disposed onboard the vehicle system. The one or more processors also are configured to determine whether to change display of the one or more locations of the at least one vehicle-of-interest on the display device based on an update to a notified state of the at least one vehicle-of-interest being received onboard the vehicle system. 
     In one embodiment, a system includes one or more processors configured to be disposed onboard a first vehicle system moving along a route. The one or more processors are configured to identify a second vehicle system moving along the route and to monitor a changing state of the second vehicle system based on a signal received from one or more of the second vehicle system or an off-board control system. The one or more processors are configured to direct a display device to present the changing state of the second vehicle system onboard the first vehicle system to an operator of the first vehicle system. 
    
    
     
       BRIEF DESCRIPTION OF THE DRAWINGS 
       The inventive subject matter may be understood from reading the following description of non-limiting embodiments, with reference to the attached drawings, wherein below: 
         FIG. 1  illustrates one example of a vehicle monitoring system; 
         FIG. 2  illustrates one example of a graphical user interface (GUI) generated by the monitoring system shown in  FIG. 1 ; 
         FIG. 3  illustrates one example of another GUI that can be displayed to receive an operator selection of a vehicle-of-interest; 
         FIG. 4  illustrates another example of a GUI that can be presented by the monitoring system shown in  FIG. 1 ; 
         FIG. 5  illustrates another example of a GUI that may be presented by the monitoring system shown in  FIG. 1 ; 
         FIG. 6  illustrates a portion of a transportation network in which a meet-and-pass event is to be performed; 
         FIG. 7  illustrates an example of an overtake event; 
         FIG. 8  illustrates one example of a conditional authority event; and 
         FIG. 9  illustrates a flowchart of one example of a method for monitoring the location of one or more vehicles-of-interest. 
     
    
    
     DETAILED DESCRIPTION 
     Embodiments of the inventive subject matter described herein relate to vehicle monitoring systems and methods that receive input to identify a vehicle-of-interest, track the position of that vehicle, and present the position(s) of that vehicle (e.g., on an onboard display device). The monitoring system can be used in a variety of different types of vehicle systems to monitor the locations and/or movements of other vehicle systems. While some description herein relates to rail vehicle systems, not all embodiments of the inventive subject matter are restricted to rail vehicle systems. One or more embodiments of the subject matter described herein can be used with automobiles, trucks, buses, aircraft, marine vessels, mining vehicles, agricultural vehicles, or other off-highway vehicles. 
       FIG. 1  illustrates one example of a vehicle monitoring system  100 . The monitoring system can be entirely or partially disposed on a vehicle system  102 , such as a rail vehicle (e.g., locomotive, transit vehicle, rail car, subway car, etc.), automobile, or the like. The vehicle system may be a single vehicle system or multiple vehicle system. For example, the vehicle system may be formed from two or more vehicles. These vehicles may be mechanically coupled with each other (e.g., by couplers) or may not be mechanically coupled (but logically coupled such that the vehicles communicate with each other to coordinate their movements with each other to travel together, as in a convoy). The vehicle system can include a propulsion system  104  and/or a brake system  106 . The propulsion system can include components that propel the vehicle system, such as one or more engines, motors, propellers, or the like. The brake system can include components to slow or stop movement of the vehicle system, such as one or more friction brakes, air brakes, motors (e.g., using regenerative braking to slow or stop movement), or the like. 
     The monitoring system includes a controller  108  that represents hardware circuitry including and/or connected with one or more processors (e.g., one or more microprocessors, integrated circuits, field programmable gate arrays, etc.). The controller can receive input that identifies a vehicle-of-interest to be tracked. For example, the monitoring system can include one or more input and/or output devices  110  (“Input/Output Device(s)” in  FIG. 1 ) that provide an identification of the vehicle-of-interest. This input/output device can represent a touchscreen, other display device, keyboard, button, switch, microphone, or the like. The input/output device can receive input from an operator onboard, from the controller, from another component of the vehicle system, or the like, that identifies one or more other vehicle systems  112  to be monitored. The vehicle system to be monitored is referred to as the vehicle-of-interest. 
       FIG. 2  illustrates one example of a GUI  200  that can be generated by the monitoring system shown in  FIG. 1  on the input/output device also shown in  FIG. 1 . The controller can direct the input/output device to display the GUI  200  to show a segment  202  of a route  204  on which the vehicle system  102  is located. The controller can direct the input/output device to display the GUI shown in  FIG. 2  to receive an operator selection of a vehicle-of-interest. In the illustrated example, the operator can select a graphical object  206 , such as a “Proximity” button, to receive the operator selection of a vehicle-of-interest. The vehicle-of-interest is another vehicle or vehicle system that is tracked by the monitoring system. 
       FIG. 3  illustrates one example of another GUI  300  that can be displayed to receive an operator selection of the vehicle-of-interest. Responsive to the input/output device(s) receiving the selection of the graphical object  206 , the controller can direct the input/output device to display the GUI  300 . The operator can use the input/output device to provide a type  302  and/or an identifier  304  of the vehicle-of-interest. The type of the vehicle-of-interest can be information that identifies a category, model, or the like, of the vehicle-of-interest. For example, the type can be a locomotive, car, truck, bus, subway car, or the like. The identifier can be an identification number or string, a serial number, a name, or the like. The identifier can be unique to the vehicle-of-interest or may be shared among different vehicles at different times (e.g., a flight number). 
     A tangible and non-transitory computer-readable storage medium (a computer memory  114  shown in  FIG. 1 ) onboard the vehicle system  102  (or off-board the vehicle system  102  but accessible by the controller) can store vehicle types and/or identifiers. The controller can access this memory  114  to determine which vehicle types and/or identifiers are associated different vehicles or vehicle systems. 
     The controller can direct the input/output device to provide an operator with a list or set of vehicles for selection as the vehicle-of-interest.  FIG. 4  illustrates another example of a GUI  400  that can be presented by the input/output device. In this GUI, a list  402  of vehicles are provided that may be selected by the operator as the vehicle-of-interest. The vehicles may be identified in the list by the type  302  and identifier  304  described above. The model type indicates the type of vehicle (e.g., rail vehicle, maintenance vehicle, automobile, etc.) and the identifier can be the unique identifier of the corresponding vehicle. 
     The controller can determine which vehicle systems  112  to display in the list based on signals received from an off-board system  118 . The off-board system can represent a computerized system that can communicate with the vehicle systems  102 ,  112  and monitor one or more locations of other vehicles. As one example, the off-board system can be a back office server of a positive control system. A positive control system can monitor locations of vehicles moving throughout a transportation network formed of interconnected routes. The positive control system can send signals to the vehicle systems to notify or inform the vehicle systems where the vehicle systems are permitted to travel. For example, the positive control system can determine which route segments are occupied by other vehicles, are undergoing maintenance, have a reduced speed limit, or the like. The positive control system can communicate signals to the vehicle systems informing the vehicle system of which route segments that the vehicle systems are allowed to enter based on the monitored conditions. Unless and until a vehicle system receives a signal from the positive control system informing the vehicle system that the vehicle system can enter into a route segment, the controller of the vehicle system does not allow the vehicle system to enter into that route segment. For example, in the absence of receiving a signal providing permission to enter into a route segment, the controller may automatically control the propulsion system and/or the brake system to prevent the vehicle system from entering the route segment. One example of a positive control system is a positive train control system. 
     As another example, the off-board system can be a back office server of a negative control system. Similar to the positive control system, the negative control system can monitor locations of vehicle systems and other conditions to notify the vehicle systems whether the vehicle systems are allowed to enter into a route segment. In contrast to the positive control system, a vehicle system may enter into a route segment unless or until the negative control system sends a signal to the vehicle system prohibiting that vehicle system from entering into the route segment. 
     Optionally, the off-board system can be a scheduling system of a transportation network formed from interconnected routes that the vehicle systems travel along. The off-board system can be a dispatch system or facility of the transportation network. As another example, the off-board system can be a traffic monitoring system, such as one or more computer servers that track the flow and/or density of traffic in different areas. 
     The controller onboard the vehicle system  102  can receive signals from the off-board system that indicate what other vehicle systems  112  are within a designated distance of the vehicle system  102 . The controller can report the location of the vehicle system to the off-board system. For example, the monitoring system can include a locator device  120  that outputs one or more signals indicative or representative of locations of the vehicle system  102 . The locator device can represent a global positioning system receiver, a dead reckoning device, a wireless triangulation device, an input device (that receives operator input indicating a location), an optical sensor (e.g., a camera that captures images or video of mileposts, signs, or the like), etc. 
     The controller can send a signal to the off-board system informing the off-board system of the location of the vehicle system  102 . The off-board system can include one or more processors that determine what other vehicle systems  112  are within a threshold distance of the vehicle system  102  based on this received location. For example, the other vehicle systems  112  can include locator devices  120  and communication devices (described below) to report the locations of the vehicle systems  112  to the off-board system. The off-board system can determine what vehicle systems  112  are within the threshold distance of the vehicle system  102 . For example, the off-board system can determine which of the vehicle systems  112  are within ten kilometers or five miles of the vehicle system  102 . The off-board system can then communicate a signal to the controller that identifies these vehicle systems  112 . The controller can include these identified vehicle systems in the list that is displayed to the operator. 
     Optionally, the controller can determine which vehicle systems  112  to include in the list displayed on the input/output device based on which vehicle systems  112  are within a communication range of the vehicle system  102 . The monitoring system (and vehicle systems  102 ,  112 ) can include a communication device  116 . The communication device can represent transceiver and hardware, such as one or more antennas, modems, or the like. The communication devices can allow the controllers of the vehicle systems  102 ,  112  to communicate with each other and/or the off-board system. 
     The controller may communicate with other vehicle systems  112  using the communication device. The controller can determine from these communications which vehicle systems  112  are within a communication range of the vehicle system  102 . The controller can then direct the input/output device to display the list of these vehicle systems. 
     The operator can use the input/output device to manually select one or more of the vehicle systems shown on the input/output device as a vehicle-of-interest. Optionally, the controller can automatically select a vehicle system as the vehicle-of-interest. For example, the controller can select the vehicle system that is closest (or closer than one or more other vehicle systems) as the vehicle-of-interest, the vehicle system that is a designated type of vehicle as the vehicle-of-interest, the vehicle system that is moving faster than one or more (or all) other vehicle systems, or the like. 
     Optionally, the selection of the vehicle-of-interest can be based on an unplanned movement event involving another vehicle. An unplanned movement event may be a change in speed, heading, or the like, that is not planned or scheduled to occur before the event occurs. For example, an unplanned movement event can include a vehicle system making an unscheduled stop, initiating a penalty break application, moving off a planned or scheduled route, experiencing degradation or mechanical failure, experiencing communication degradation or loss, etc. 
     As another example, the vehicle-of-interest may be selected based on the vehicle-of-interest and the vehicle system having the monitoring system traveling on a common route in the transportation network. This common route is the same route, track, road, or the like. The monitoring system may select the vehicle-of-interest in this way to allow the monitoring system to coordinate movement of the vehicle system  102  with the movement of the vehicle-of-interest for a movement event, as described below. 
     The vehicle system involved in the unplanned event can communicate a signal to the monitoring system directly or can communicate a signal to the off-board system notifying the off-board system or the monitoring system of the unplanned event. If the signal is sent to the off-board system, the off-board system can inform the controller of the monitoring system of the unplanned event. Based on the reporting of this unplanned event, the controller may identify the vehicle system involved in the unplanned event as the vehicle-of-interest. The controller can select the vehicle having or experiencing an unplanned movement event as the vehicle-of-interest. Optionally, the controller can notify the operator of the vehicle having or experiencing the unplanned movement event and the operator can select this vehicle as the vehicle-of-interest. 
     Optionally, the selection of the vehicle-of-interest may be based on a model type of the vehicle-of-interest. For example, the operator or controller may select a vehicle system as the vehicle-of-interest based on the vehicle system being one or more designated types of vehicles. A vehicle system may be selected as a vehicle-of-interest when the vehicle system is a maintenance vehicle, is a different type of vehicle than the vehicle system in which the monitoring system is disposed, or the like. 
     Once the vehicle-of-interest is identified, the controller of the monitoring system can determine where that vehicle system is located. For example, the controller can directly communicate with the vehicle-of-interest to determine where the vehicle-of-interest is located. This direct communication can involve the vehicle systems sending wireless signals to each other via communication devices, cellular towers, repeaters, or the like, but without the signals being acted upon or used by these devices (other than to forward or route the signals). 
     As another example, the vehicle systems  102 ,  112  may communicate the locations of the vehicle systems to the off-board system. This off-board system can then provide one or more of these locations to the controller of the monitoring system via the communication device. For example, the controller can send the operator-provided identifier of the vehicle-of-interest to the off-board system. The off-board system can communicate the last known location or last reported location of the identified vehicle-of-interest to the controller. 
       FIG. 5  illustrates another example of a GUI  500  that may be presented by the controller on the input/output device onboard the vehicle system  102  shown in  FIG. 1 . The GUI  500  shows a location  502  of the vehicle system  102  on the route  204 . In the illustrated example, this location of the vehicle system is at or near the nineteenth milepost or mile marker along the route. The GUI  500  also shows a state icon  504  representing a notified state of the vehicle-of-interest. The notified state includes information about the vehicle-of-interest as reported by the vehicle-of-interest and/or the off-board system. 
     The state of the vehicle-of-interest can include the current or last reported location of the vehicle-of-interest. Optionally, the state can include additional or other information about the vehicle-of-interest. This additional or other information can include the unique identifier of the vehicle-of-interest, a speed at which the vehicle-of-interest is moving or was reported as moving, a direction of travel of the vehicle-of-interest, or the like. Although only a single vehicle-of-interest is shown in the GUI  500  in  FIG. 5 , optionally, the controller may monitor the locations of multiple vehicles of interest and direct the input/output device to display multiple state icons representative of these locations of the multiple vehicles of interest. 
     The controller of the monitoring system may change display of the state icon representing the vehicle-of-interest on the input/output device. The controller may direct the input/output device to change where the state icon is shown along the route on the GUI responsive to the location of the vehicle-of-interest changing. Optionally, the controller may change how the icon representing the vehicle-of-interest is displayed responsive to not receiving an update to the state or location of the vehicle-of-interest. The controller may determine whether a signal is received from the off-board system and/or the vehicle-of-interest at least once every designated time period, such as every 30 seconds, every minute, every 5 minutes, or the like. Responsive to not receiving an update to the state of the vehicle-of-interest, the controller may direct the GUI to change how the icon representing the vehicle-of-interest is displayed. For example, the controller may direct the input/output device to change a color, size, shape, or the like, of the icon representing the vehicle-of-interest. 
     Optionally, the controller can direct the input/output device to display a notification to the operator that the state of the vehicle-of-interest has not been updated within the designated time. In one embodiment, the controller can direct the input/output device to stop displaying the icon of the vehicle-of-interest responsive to the state of the vehicle-of-interest in not being updated within the designated time period, responsive to the state of the vehicle-of-interest not being updated within several of the designated time periods, or responsive to the location of the vehicle-of-interest indicating that the vehicle-of-interest is no longer within a designated range or distance of the monitoring system. 
     In one embodiment, the controller may display a warning message on the input/output device responsive to the state of the vehicle-of-interest changing by more than a designated amount. For example, if the distance between a recently reported location of the vehicle-of-interest and the previously reported location is greater that he threshold distance, the controller may display a warning message on the input/output device to notify the operator of the large change in distance. As another example, if the speed of the vehicle-of-interest changes by more than a threshold amount between reported states of the vehicle-of-interest, the controller may direct the input/output device to display a warning message to the operator. 
     The controller of the vehicle system  102  and/or the operator of the vehicle system  102  can use the reported state of the vehicle-of-interest to control movement of the vehicle system  102 . For example, the vehicle system  102  having the monitoring system  100  may be approaching a movement event that involves or requires the absence of the vehicle-of-interest. One example of a movement of event can be a meet-and-pass event. Another example of such a movement event is an overtake event. Another example of a movement event is a conditional authority event. The vehicle system  102  and/or operator may need to know the state of the vehicle-of-interest to perform or complete the movement event. 
       FIG. 6  illustrates a portion of a transportation network  600  in which a meet-and-pass event is to be performed. The transportation network includes several interconnected routes on which the vehicle systems may travel. These routes can include tracks, roads, highways, waterways, or the like.  FIG. 6  illustrates the route  204  with the vehicle system  102  and a vehicle system  112  identified as a vehicle-of-interest. The route  204  may be referred to as a primary route or mainline route, while an intersecting route  602  may be referred to as a secondary route, a siding route, or another route. 
     The vehicle system  102  may be heading in a first direction  604  along the primary route  204  (e.g., left in  FIG. 6 ) while the vehicle-of-interest  112  may be moving in an opposite second direction  606  along the route  204  (e.g., right in  FIG. 6 ). The meet-and-pass event includes the vehicle-of-interest leaving the primary route and entering the secondary route to allow the vehicle system  102  to continue on the primary route and pass the vehicle-of-interest. This allows the vehicle system  102  to pass the vehicle-of-interest  102 . 
     The vehicle system  102  can control when the vehicle system  102  arrives at or near an intersection  608  between the primary and secondary routes based on the monitored locations of the vehicle-of-interest. For example, the controller of the vehicle system  102  can monitor the locations of the vehicle-of-interest and determine when or approximately when the vehicle-of-interest will leave the primary route and enter onto the secondary route. The operator and/or controller of the vehicle system  102  can monitor the locations of the vehicle-of-interest to determine whether to speed up or slow down movement of the vehicle system  102 . For example, the controller and/or the operator of the vehicle system  102  can control how quickly or slowly the vehicle system travels toward the intersection between the primary and secondary routes to prevent arriving at the intersection too early (before the vehicle-of-interest is able to exit on the secondary route) and having to wait for the vehicle-of-interest to exit onto the secondary route. As another example, the vehicle system  102  may travel toward the intersection more quickly if the vehicle-of-interest arrives and exits onto the secondary route earlier than expected. 
       FIG. 7  illustrates an example of an overtake event. In the overtake event, both the vehicle system  102  and the vehicle-of-interest  112  are traveling in the same direction  606  along the primary route toward the intersection with the secondary route. The vehicle system  102  is trailing behind the vehicle-of-interest. The overtake event may involve the vehicle-of-interest exiting the primary route on the secondary route to allow the vehicle system  102  to pass the vehicle-of-interest along the primary route. Similar to the meet-and-pass event, the controller and/or operator of the vehicle system  102  can monitor the locations of the vehicle-of-interest to determine whether to speed up or slow down during the overtake event to avoid arriving at the intersection of the primary and secondary routes too early or later than needed. 
       FIG. 8  illustrates one example of a conditional authority event. In the conditional authority event, the vehicle system  102  receives a signal from the off-board system informing the vehicle system  102  whether the vehicle system is able to enter into the route segment  202  along the primary route  204 . This signal may be sent to the vehicle system  102  once the vehicle-of-interest exits the route segment  202 . Unless and until the vehicle-of-interest exits the route segment  202 , the vehicle system  102  may not enter the route segment  202 . The vehicle system  102  may monitor locations of the vehicle-of-interest to determine when or approximately when the vehicle-of-interest exits the route segment. The controller and/or the operator of the vehicle system may then control the vehicle system to ensure that vehicle system does not arrive too early to the route segment  202  (for example, much earlier than the exit of the vehicle-of-interest from the route segment  202 ). 
       FIG. 9  illustrates a flowchart of one example of a method  900  for monitoring the location of one or more vehicles-of-interest. The method  900  can represent operations performed by the controller of the monitoring system shown in  FIG. 1 . At  902 , a vehicle-of-interest is determined. As described herein, the vehicle-of-interest may be identified based on operator input, based on selection from a list of potential vehicles of interest, based on a type of vehicle, based on an unplanned movement event, or the like. 
     At  904 , the location of the vehicle-of-interest as determined. This location can be directly reported from the vehicle-of-interest to the monitoring system. Optionally, the location of the vehicle-of-interest can be monitored by the off-board system and reported to the monitoring system. 
     At  906 , a determination is made as to whether the vehicle-of-interest is within a designated range or distance of the vehicle system having the monitoring system. If the vehicle-of-interest is within this range or distance, then flow of the method  900  can proceed toward  908 . But, if the vehicle-of-interest is not within this range or threshold distance, then the location of the vehicle-of-interest may not be displayed or presented onboard the vehicle system  102 . As a result, flow of the method  900  can return toward  902 . 
     At  908 , the location of the vehicle-of-interest is displayed. For example, the controller of the monitoring system can direct the input/output device to display a GUI with an icon representing the location of the vehicle-of-interest. The location of the vehicle system having the monitoring system optionally made to be displayed so that the operator of the vehicle system  102  can determine how far the vehicle system and the vehicle-of-interest are from each other. 
     At  910 , a determination is made as to whether a signal regarding the state of the vehicle-of-interest has been received within a designated time. For example, the controller may determine whether a signal from the vehicle-of-interest and/or from the off-board system has been received within the last 30 seconds, 1 minute, 5 minutes, or the like. If no signal has been received within this time period, this can indicate that the current state of the vehicle-of-interest may no longer be known, that the vehicle-of-interest has moved outside of a range of the monitoring system, or the like. Responsive to determining that the signal has not been received within the designated time period, the method  900  can proceed toward  912 . 
     At  912 , display of the vehicle-of-interest is changed. For example, the icon representing the vehicle-of-interest may change color, size, shape, or the like to visually notify an operator that the displayed state of the vehicle-of-interest has not been recently updated. Optionally, the icon representing the vehicle-of-interest may no longer be displayed. Flow of the method  900  may then terminate or may return back toward the previous operation, such as to  902 . 
     If, on the other hand, the signal informing the monitoring system of the state of the vehicle-of-interest has been received within the designated time period, then flow of the method  900  can return toward  904  from  910 . In this way, the method  900  may return in a loop wise fashion to repeatedly determine the location of the vehicle-of-interest and update display of the vehicle-of-interest as needed. 
     In one embodiment, a method includes receiving a selection of at least one vehicle-of-interest onboard a vehicle system moving along one or more routes in a transportation network. The at least one vehicle-of-interest is disposed on the one or more routes in the transportation network. The method also includes monitoring one or more locations of the at least one vehicle-of-interest from onboard the vehicle system, displaying the one or more locations of the at least one vehicle-of-interest on a display device disposed onboard the vehicle system, and determining whether to change display of the one or more locations of the at least one vehicle-of-interest on the display device based on an update to a notified state of the at least one vehicle-of-interest being received onboard the vehicle system. 
     Optionally, the method also includes changing operation of the vehicle system based on at least one of: the one or more locations of the at least one vehicle-of-interest or the state of the at least one vehicle-of-interest. 
     Optionally, the selection of the at least one vehicle-of-interest is received based on one or more of a planned meet-and-pass event or a planned overtake event between the at least one vehicle-of-interest and the vehicle system. 
     Optionally, the selection of the at least one vehicle-of-interest is received based on the vehicle system and the at least one vehicle-of-interest being located on a common route of the one or more routes. 
     Optionally, the selection of the at least one vehicle-of-interest is received based on the vehicle system trailing behind the at least one vehicle-of-interest on the common route. 
     Optionally, the selection of the at least one vehicle-of-interest is received based on the vehicle system moving toward a segment of the one or more routes where the vehicle system has a conditional authority to enter the segment of the one or more routes that is based on an absence of the at least one vehicle-of-interest in the segment of the one or more routes. 
     Optionally, the selection of the vehicle-of-interest is received based on a prior unplanned event of the at least one vehicle-of-interest. 
     Optionally, the selection of the at least one vehicle-of-interest is received based on a model type of the at least one vehicle-of-interest. 
     Optionally, the selection of the at least one vehicle-of-interest is received based on input of an identifier of the at least one vehicle-of-interest. 
     Optionally, the selection of the at least one vehicle-of-interest is received based on selection of the at least one vehicle-of-interest from a set of potential vehicles provided by an off-board system. 
     Optionally, the one or more locations of the at least one vehicle-of-interest is monitored from onboard the vehicle system by receiving one or more signals at the vehicle system from the at least one vehicle-of-interest. 
     Optionally, the one or more locations of the at least one vehicle-of-interest is monitored from onboard the vehicle system by receiving one or more signals at the vehicle system from an off-board system. 
     Optionally, determining whether to change display of the one or more locations of the at least one vehicle-of-interest is displayed on the display device includes determining whether the one or more locations of the at least one vehicle-of-interest has changed. 
     Optionally, determining whether to change display of the one or more locations of the at least one vehicle-of-interest on the display device includes changing display of the one or more locations responsive to the update to the notified state of the at least one vehicle-of-interest not being received within a designated period of time. 
     In one embodiment, a system includes one or more processors configured to determine at least one vehicle-of-interest onboard a vehicle system moving along one or more routes in a transportation network. The at least one vehicle-of-interest is disposed on the one or more routes in the transportation network. The one or more processors are configured to monitor one or more locations of the at least one vehicle-of-interest from onboard the vehicle system and to direct display of the one or more locations of the at least one vehicle-of-interest on a display device disposed onboard the vehicle system. The one or more processors also are configured to determine whether to change display of the one or more locations of the at least one vehicle-of-interest on the display device based on an update to a notified state of the at least one vehicle-of-interest being received onboard the vehicle system. 
     Optionally, the one or more processors are configured to determine the at least one vehicle-of-interest based on one or more of: a meet-and-pass event between the at least one vehicle-of-interest and the vehicle system, an overtake event between the at least one vehicle-of-interest and the vehicle system, a conditional authority event between the at least one vehicle-of-interest and the vehicle system, the vehicle system trailing behind the at least one vehicle-of-interest, an unplanned event of the at least one vehicle-of-interest, a model type of the at least one vehicle-of-interest, or an identifier of the at least one vehicle-of-interest. 
     In one embodiment, a system includes one or more processors configured to be disposed onboard a first vehicle system moving along a route. The one or more processors are configured to identify a second vehicle system moving along the route and to monitor a changing state of the second vehicle system based on a signal received from one or more of the second vehicle system or an off-board control system. The one or more processors are configured to direct a display device to present the changing state of the second vehicle system onboard the first vehicle system to an operator of the first vehicle system. 
     Optionally, the first vehicle system is a rail vehicle system and the one or more processors are configured to direct the display device to present the changing state of the second vehicle system while the second vehicle system remains located within a threshold distance of the rail vehicle system. 
     Optionally, the one or more processors are configured to control movement of the first vehicle system during a movement event involving the first vehicle system and the second vehicle system based on the changing state of the second vehicle system. 
     Optionally, the movement event includes one or more of a meet-and-pass event, an overtake event, or a conditional authority event. 
     The singular forms “a”, “an”, and “the” include plural references unless the context clearly dictates otherwise. “Optional” or “optionally” means that the subsequently described event or circumstance may or may not occur, and that the description may include instances where the event occurs and instances where it does not. Approximating language, as used herein throughout the specification and claims, may be applied to modify any quantitative representation that could permissibly vary without resulting in a change in the basic function to which it may be related. Accordingly, a value modified by a term or terms, such as “about,” “substantially,” and “approximately,” may be not be limited to the precise value specified. In at least some instances, the approximating language may correspond to the precision of an instrument for measuring the value. Here and throughout the specification and claims, range limitations may be combined and/or interchanged, such ranges may be identified and include all the sub-ranges contained therein unless context or language indicates otherwise. 
     This written description uses examples to disclose the embodiments, including the best mode, and to enable a person of ordinary skill in the art to practice the embodiments, including making and using any devices or systems and performing any incorporated methods. The claims define the patentable scope of the disclosure, and include other examples that occur to those of ordinary skill in the art. Such other examples are intended to be within the scope of the claims if they have structural elements that do not differ from the literal language of the claims, or if they include equivalent structural elements with insubstantial differences from the literal language of the claims.