Things You'll Need
Instructions
Add the bridge abutments. These go at each end of the gap to span, and they reach from the top of the railroad bed down to either the opposite end of the abutment or the highway, body of water or gorge. Secure these in place with hobby adhesive.
Install the bridge. If you have only one bridge section, then set it in place to rest on the two bridge abutments. For bridge spans that require multiple sections, place the bridge piers underneath where each section meets. Be sure to glue the bottom of the base of each bridge pier to the appropriate place underneath each joint.
Lay the track. Depending upon your bridge design, you will need first either to fish the track through the bridge, such as for a Warren truss, or simply lay the track in place, such as for a deck bridge. Be sure to use rail joiners to connect the track on the bridge between the track sections at either end of the bridge.