Yes, and many similar rides today still use that system. A section of track can be swinged away, and vehicles can be pushed off, using the wheels on the vehicles.Since Midget Autopia used electric motors and a busbar like the dark rides, it looks like the CMs would manually push the extra cars on or off? Is that how it worked?
Heck, I think Disneyland in the 1950's would take the vehicle, and push it down the sidewalk (when the park was closed) to take it backstage for major repair/service. Minor stuff was done at the ride,