Smr Simple!

Map Components Depots:
These are Depots and Annexes you can add to your custom map.
For SAM maps the Assets folder should be placed in your UserMaps folder.
For other type of maps it also can be placed in the CustomAssets folder. There are really no strict rules about it.
The XLM normally be added to the RRT_TrainCars_Depots.XLM file

Passenger Depot Green Mars
This will replace the stock Firaxis passenger depot.

Passenger Station Green Mars
This will replace the stock Firaxis passenger station.

Generic Annex
You can replace the word "Generic" with your own definition in the XML file