Mods/TrainCarts/Signs/Spawner

Introduction
The train spawner sign allows you to spawn complete trains up to 30 carts long. Trains are spawned to the text-side of the sign on the rails above. When it receives power while it was unpowered before, it will trace down the tracks and spawn a train on it if there are no other trains occupying the rails.

Second line
spawn, optionally followed up by the forward force to spawn the train at.

Third and fourh lines
The minecart types to spawn, using p, m or s characters. The resulting train will be spawned with the same types in the same order as set on the train.