Complete the levels by building a railorad track that has at least the minimum number of required parts for that level.
Click on the empty squares in the field to place the next track part on that location.
Click on the available tools to rotate the upcoming part or destroy the ones already placed in the field.
You do not need to reach the end station to advance to the next level, but doing so will grant you extra points.
Click on the Start station to start the train early.