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A lot of a railroads operational need for electricity depends on the diesel electric generators that are mounted under the passenger car frames to deliver electricity to each car which is how was done as it segregate's the need for power generation in a single car that will provide power for cooling, lighting and heating.

I am not sure if the new AMTRAK locomotives use steam generators for car heating or medium voltage resistance heating is used in each car in the AMTRAK passenger car fleet using medium voltage cables between each car to deliver power for resistance heating and lighting.

Simple steam heating for a railroad passenger car uses a water reservoir in the locomotive engine compartment to make steam and the steam which I believe is or was single pipe wet steam is piped to each cars heating system via a steam connection hose between each car and I believe the last car was where the wet steam was vented.

Amtraks dining cars have propane tanks mounted under the galley cars where the dinners are cooked and served or at least they were anyway.

I am not sure if they have converted their new galley kitchen cars to induction flat tops, electric ovens and electric powered broilers.

Using an air to air heat pump cooling and heating system with fans and ducting for that mexican passenger railway is simpler than using a traditional cooling and heating system with a furnace mounted under each car.