In most levels the station will be in the center of the land, so whether you use the majority of the left or right of the station is up to you. In the test levels i play in the video there is no room to the right, so i am forced to make a tight turn into the station. In the full game you will probably head left, turn, then have a brake run straight into the station. You won't pass the stage if the train can't stop in the station!
It depends how long you want to spend on levels as to how long it takes to complete! The levels will have a score system, so if you want to get the best score you will have to play each level a few times to figure out how! At the moment i'm considering an online high score ranking table so you can see the top 3 scores for each level! I am planning for 15 levels to be in the game, all nice and different!
There will also be a sandbox mode, and there is likely to be a level editor so you can make levels and share them with people.