4-8-2 "Mountain" steam locomotive - dark green
The larger engine's number is 7138, and the name of the railroad is Brick Railway Systems. The former goes on the cab, while the latter goes on the tender walls. The smaller loco's number is 4613 which goes on the cab. The space at the rear of the train and the tender of the small engine both are supposed to say BRS. All of this is possible in printed 1 x 1 black tiles.
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Use LEGO Digital Designer to open these files and generate step by step building instructions.
This MOC also has a 3D digital file available (eg LDD, MPD, etc): 3D Model