Edit post

Edit your reply below.

Post Body
Enter your post below.
Most railrods now use concrete girders where they can, say up to 100-ft spans, beyond that if headroom is enough, they want deck girders. All new bridges will have either a steel pan or concrete pan to hold the ballast, normally 0.5 feet deep below the tie. Through girders have to be braced from the transverse floor beams up to the top of the through girder, thus adding width. The through girgers, as mentioned above, have transverse floor beams 24 to 36-inches in depth placed 3 to 4 feet on centers. <br /> <br />The concrete girders used are "I" shaped like the ones used on highways. With either, the concrete pan is "Composite", meaning that it helps the girders carry the load. Don't forget that many bridges will have a walkway too. Especially if they are long, turn outs close, or for any other reason that the crewmay have to walk the bridge. Also, increase width if bridge is in a curve.
Tags (Optional)
Tags are keywords that get attached to your post. They are used to categorize your submission and make it easier to search for. To add tags to your post type a tag into the box below and click the "Add Tag" button.
Add Tag

Update Reply

Login, or register today to interact in our online community, comment on articles, receive our newsletter, manage your account online and more!

Model Railroader Newsletter See all

Sign up for our FREE e-newsletter and get model railroad news in your inbox!