Width of Bridge on curved track?

http://i220.photobucket.com/albums/dd51/Hwolf_photos/Best%20of%20Wolfcreek/IMG_2567.jpg

What would be the width of an approx 70’ Truss Bridge going over a 24" Radius Curve? Does any one know if the Eagle Truss Bridge from Mid West is designed to expand? The bridge will be going over the middle track in the Link above. The first track will be for the newly build trestle. Thanks to all the guys who helped with answers while building this trestle.

Isn’t the truss section of the bridge in the picture upside down? There doesn’t seem to be anything holding up the ends where they meet the trestle.

If its a truss bridge going OVER the track then the bridge has to be wider than the clearance of the cars. If the truss is going UNDER the track then it has to be as wide as the ties.

In HO allowing 13 ft wide clearance (6.5 feet from the center of the track, the INSIDE of the trusses on a 70 ft long truss on 24 in radius would have to be 16.6 scale feet wide or about 2 3/8 in.