By tapping the image of the necessary means of transport you can leave the contract initiation window and enter the Trains Blocking window. Here you can choose the locomotive model, and after that, the suiting carriage type. If you are not satisfied with the result, tap the Undo button. The carriages’ type and number depend on the type of the locomotive you choose. The more carriages you have, the more resources you’ll be able to transport during the contract and the more profit you get.