Underneath a B&M coach car.
A coach car from the Boston & Maine railroad. This particular car, located in Bedford, Massachusetts, is likely one that was used for the greater-Boston area commuter rail service, before the service was taken over by Amtrak.
Some books on the topic:
The old train depot in Bedford, Massachusetts, built in 1784.
Backing up the steam locomotive to couple it with the rest of the train. You can learn to drive a steam locomotive yourself.
Boarding the Essex Steam Train.
The KarTrak system was developed by GTE Sylvania (Waltham, Massachusetts) in the 1960s to identify and track railroad cars and containers (e.g. SeaLand). It used a vertically-stacked series of color-coded reflective barcode labels from 3M to encode each car’s car number. The barcodes were read by mailbox-sized scanners installed trackside.