Interesting Wrote:
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> First, what kind of car is this? Cafe? Bar? Dining?

A dining car with an unconventional seating arrangement. The items on the tables suggest it's a dining car.

> Hmm, is the suggestion that a guy can buy paid services from a lady aboard NYC's trains?

You're confusing this train with S.P.'s LARK and perhaps the working girl on the left fled his room after she didn't deliver on what was negotiated earlier and went to the diner, and then he followed her and wanted a refund.

These types of transactions take place on airplanes today, but are confined to the cramped quarters of the restrooms.