For those who are saying you like the bridge-building and think it's original, you should check out the Cargo Bridge series. It's even better since you don't have to restrict your bridge to a little grid and there are all kinds of cool level setups. The series has three installments I think.
A big problem I have with this game is that you have to build the same exact track every single level. There's no variation in how you make the horizontal bridge pieces that the train goes on. It's always just one two-tile piece after another all the way across. The game should just put those there automatically.