How is battery voltage transferred on M-3 trains?

Answer: C — Through electric couplers on the F end and jumper cables

The transfer of battery voltage on M-3 trains occurs through electric couplers on the F end, in conjunction with jumper cables. This design allows for a seamless flow of electrical power between coupled trains, ensuring that the systems dependent on battery voltage, such as lighting and control circuits, operate effectively. Electric couplers serve a critical function in facilitating communication and power transfer between units, particularly at the F end where trains connect. The jumper cables supplement this by providing additional paths for the electrical circuits, enhancing reliability and maintaining power continuity especially when trains are coupled together for operation. This setup is particularly useful in scenarios where multiple trains are operated in tandem, ensuring that all connected units are adequately supplied with power for their essential functions.