The Trainstation portal features a minigame which you can play once a day. A spin of the train will yeild a random resource. The amount you get is dependent on your level and the number of days in a row you visit. The base amout you receive is 50 times your level. For each consecutive day you can get a bonus 10% up to a maximum of 50%.
It is also possible to get gems however only a single gem is rewarded regardless of level or the number of days visited.