I came across this four minute YouTube video that talks about a practice of dropping passenger cars on the fly, from the late 1880s up to around 1940 in England and parts of Europe, but also said to be used a little in the U.S. It might add a little twist to your operating sessions.
https://www.youtube.com/watch?v=IiHh90KkyBQ
https://www.youtube.com/watch?v=IiHh90KkyBQ
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