Track occupancies that appear following a train movement will show an arrow in the direction of the preceding train. Track occupancies that appear independent of a train movement will not display an arrow. Form A slow orders, indicated the temporary maximum speed for that track appear in red letters adjacent to track segments. Form B orders for track maintenance appear in yellow letters adjacent to track segments. Orange symbol indicates that the train is under manual routing.
Yellow symbol indicates that train is performing intermediate work events at that location.
A flashing white or flashing yellow train symbol indicates that the computer is not able to compute the train route and dispatcher intervention is required. A flashing blue to white train symbol indicates that the train is on short time and may not be able to reach its next crew change point before the current crew expires under the hours of service. Switches without power need to be manually operated from the field. The location of HotBox Detectors is designated as small triangles with the letters HBD underneath. Hot box detectors are used to check for overheated wheel bearings and dragging railcar equipment at numerous locations across the system.