Moose Transport

There actually is a story behind this wagon:

At a certain point in time, the Moose statue was added to the Trainstation game. At fist not that many players cared about the new decoration, but a few days later an active player of the game saw a sation with about 25 of those statues, and posted about it on the Trainstation Forums.

However the player's intention was completely different, the stories of these moose got a life of their own, and at eventually reached the developers of Trainstation. Resulting in them putting this wagon in the game and supporting the joke in their own way.