Trains have safety couplings so if a car in the middle of the train jumps the track the engineer can cut it loose and book. If the engine is/was on the right then he must have left some, or all, the cars behind.
I'm not sure, but I doubt the engineer can dump cars selectively from the cab.
If the engine was/is on the left, when the cars started jumping the tracks and piling up, it would stop the cars behind them dead, and the engine with or without some cars would get the hell out of there.
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The descent of man ~ Nixon, Friedman, Reagan, Trump.
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