HowTo/Build a bridge
From TrainzOnline
Notes
For bridges in TRS 2010 and 2012 need to have "mesh-table" 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.