On which side of a C-3 car are the truck cut-outs located?

Answer: C — Inside the West vestibule

The truck cut-outs on a C-3 car are specifically located inside the West vestibule. This placement is designed for easy access to maintain and inspect the truck assemblies, which are critical components that support the car body and allow for smooth movement along the tracks. By having the cut-outs in the West vestibule, maintenance personnel can perform their duties more efficiently without needing to access the areas outside of the car, thereby ensuring safety and operational effectiveness. The other locations mentioned would not provide the same level of accessibility for maintenance or inspection tasks necessary for the proper functioning of the air brakes and truck systems. For example, locating them outside a vestibule or in the southside doors would complicate maintenance procedures and potentially hinder rapid access in case of an emergency or routine checks. Thus, the placement of the truck cut-outs in the West vestibule is both practical and strategically advantageous for ongoing maintenance operations.