Please select the most similar patent number from A, B, C and D. Which number is?
A single-station lightweight suspension railway transit system, the tracks whereof are suspended above ground by means of support columns and beams, and the system comprising: rail cars (9) suspended beneath the rails, a main rail (3) being provided for said rail cars (9) to run upon; suspended stop rails (5) provided parallel thereto for the rail cars (9) to stop upon, braking rails (4) for speed reduction which turn towards the stop rails (5), restart and acceleration rails (7) which return to the main rail (3), turnout and track-switching equipment, and rail-car elevator assemblies (10) for causing the rail cars (9) to be lowered and raised. The rail cars (9) are compact and lightweight and comprise smart terminals; also comprised are a smart car control system, and an overall scheduling control center.
A: An personal hanging type double-rail and double-power automatic control light rail traffic system comprises a rail system, rail vehicle power systems, a rail vehicle traffic network control system, a rail vehicle compartment system, a rail vehicle power supply system, and a rail vehicle stop station system. The rail system is provided with two rail lines (28, 29), which are a left side straight rail line and a right side turning rail line that are in parallel but are different in top face level, and the two power systems of a left side straight rail drive device and a right side turning rail drive device are separately disposed above the two rails. A relative distance between the turning drive device and the turning rail is changed by using a lifting device, and meanwhile, under the effect of a change of the relative level between the straight rail and the turning rail, switching of a rail vehicle between the left side straight rail and the right side turning rail is implemented. A central computer control system is used in cooperation in the system, automatic control is achieved, and the rail vehicle autonomously travels.
B: A single and double-decker variable recreational vehicle, comprising a regular carriage (1) and an upper carriage disposed above the regular carriage, the top panel (7) of the regular carriage serving as the bottom panel of the upper carriage. The upper carriage comprises a top roof (2), a top roof side skirt (3), a bottom panel upper skirt edge (9), a top roof lower skirt edge (10), and a foldable side fence (6). The recreational vehicle is also provided with a single and double-decker conversion system, which comprises a plurality of vertically disposed lifting support devices. The lifting support devices are each at least composed of a main body (4) and a lifting column (5) and are symmetrically distributed on both sides of the vehicle body of the recreational vehicle. The main body is fixedly connected to a side fence frame of the regular carriage. The lower end of the main body is connected to the vehicle body chassis of the regular carriage, and the upper end of the main body is connected to the top panel of the regular carriage. The lifting column is retractably inserted into the interior of the main body. The upper end of the lifting column is connected to the top roof of the upper carriage. The main body has an extending segment that protrudes from the bottom panel of the upper carriage. The functions of a house and a vehicle are fused by means of single and double-decker conversion, thus costs are low and said vehicle is economical.
C: A railway side-tipping wagon comprises: an underframe assembly (1); a wagon assembly (2) installed at the top of the underframe assembly (1); a side door (3) hinged to one side of the wagon assembly (2); a side door opening/closing mechanism (4) for controlling opening and closing of the side door (3); a bogie (8) installed at the bottom of the underframe assembly (1); an air brake device (5) installed at the bottom of the underframe assembly (1) and capable of performing service braking on a wheel of the bogie (8); a parking brake device (6) installed at the bottom of the underframe assembly (1) and capable of performing parking braking on the wheel of the bogie (8); and a coupler cushioning device (9) installed at an end portion of the underframe assembly (1). The present invention further comprises a pneumatically-controlled hydraulic system (7) for controlling multiple side door opening/closing operation cylinders (4.1) of the side door opening/closing mechanism (4).
D: Disclosed are a system for passengers to get on and off a vehicle without the vehicle needing to stop, and a method therefor. The system comprises an operating vehicle (100) and a platform (200), wherein the operating vehicle (100) comprises a vehicle body (110) and a vehicle carriage connection portion; the vehicle carriage connection portion is arranged on the vehicle body (110); and the platform (200) comprises a platform and carriage connection portion and a platform body. The system for passengers to get on and off a vehicle further comprises a plurality of separate-type carriages (300). The plurality of separate-type carriages (300) is divided into carriages for passengers to get on (310) and carriages for passengers to get off (320). The plurality of separate-type carriages (300) is transmitted between the vehicle carriage connection portion and the platform and carriage connection portion so that the actions of passengers getting on and off a vehicle can be completed without the vehicle needing to stop.
Answer: A