Once the required number of parts are obtained to build a train, clicking on the "Craft" button will add the train to the Yard.
 Extending your Trains
Let´s take the Rio Grande Standard engine for example: it can be extended with two more engines to a total of three engines.
Each extra engine adds 50% car capacity:
- Base Model: 12 cars
- Base Model + Extra Engine: 18 cars
- Base Model + 2 Extra Engines: 24 cars
Let's take the Rio Grande Standard engine for another example: it can be extended with two more fuel cars to a total of one engine and two fuel cars.
Adding a fuel car doubles the base fuel, while adding two fuel cars triples the base fuel.
- Base Model: 600
- Base Model + Extra Fuel car: 1200
- Base Model + 2 Extra Fuel cars: 1800
As a result, the Rio Grande Standard can be extended with two more engines and two more fuel cars to a total of three engines and two fuel cars. Here are the combinations:
- Base Model: 12 cars + 600 fuel
- Base Model + Extra Engine: 18 cars + 600 fuel
- Base Model + 2 Extra Engines: 24 cars + 600 fuel
- Base Model + Extra Fuel car: 12 cars + 1200 fuel
- Base Model + 2 Extra Fuel cars: 12 cars + 1800 fuel
- Base Model + Extra Engine + Extra Fuel car: 18 cars + 1200 fuel
- Base Model + 2 Extra Engines + Extra Fuel car: 24 cars + 1200 fuel
- Base Model + Extra Engine + 2 Extra Fuel cars: 18 cars + 1800 fuel
- Base Model + 2 Extra Engines + 2 Extra Fuel cars: 24 cars + 1800 fuel
The number of trains a player can have in service is limited by the number of railroads they have purchased. At the start of the game, the player is given two railroads for free, but each additional railway costs an increasing number of coins. The cost of building an additional railroad follows the following formula where "x" is the number of the railroad you are building:
cost = (square_root(x-1)^3)*1000
|Cost of Railroads|
 Train Yard
Main Article: Yard
Unused trains can be sent to the player's yard by shutting down the railroad. It costs nothing to do so, but will cost again to put it back on the railroad. Storage here is indefinite and unlimited.
This functionality can be utilized to move a train to a city it would otherwise not be able to reach by rail, particularly handy for dealing with global events and reshaping the player's train network.
Main Article: Trading
Parts can be gifted to other players by entering their gift codes (not yours). Your gift code can be found in the settings menu.
Trading allows players to exchange train parts for those that they need - the pseudo random method of opening crates gives players lots of unwanted or unusable parts, and these can be exchanged for parts that they need.
'Gifting' parts costs Bux - the Bux needed to send one part is the same as the number of parts needed to build that train. For example, sending a Century Limited part costs 13 Bux because you need 13 Century Limited parts to make one train. This means that trading higher level trains is often very expensive, and different values are placed on different train parts: Steamer parts are often placed very low on the value list, as they are the most common parts, while Special Crate parts are often placed very highly.