HowTo/Build a bridge
From TrainzOnline
Creating a Bridge in GMax
This tutorial will show you the steps needed to create a model in GMax 1.2 and then the creation of the config file and the directory structure required for the use of the bridge in TRS 2012.
Notes
For bridges in TRS 2010 and 2012 need to have "mesh-table" in the config file so as the middle (repeating section) of the bridge actually shows within the simulator. This will need to be added using Content Creator Plus to the config file. In the mesh-table you need to create a "default" value. This default value will the the main (repeating section) of the bridge. Also add an "auto-create" so as it is created automatically in the surveyor.