This is a trigger to be placed where the train crosses over a bridge to simulate the sound of a train crossing a bridge. It makes a clickety-clack noise, (like a train over points), when trains pass over it. It may not work in all versions of Trainz. Set Trigger Radius to '1' for the best effect. (Re-Modifided by Swedar of davesnow's modification with permission from Boat (thanks!) Full credit goes to boat and davesnow!
See instructions in dialogue box or a full tutorial at www.boatztrainz.co.uk