True, but it is simple enough of a design that one could fabricate something similar out of styrene or modeller's plywood.
I have two of the unassembled bridge kits that I'm planning on using with roadway decking to span a river. Here's a picture of the Pembroke, VA bridge spannibg the New River and the N&W mainline.
![118464-M[1] 118464-M[1]](https://ogrforum.com/fileSendAction/fcType/0/fcOid/17479526151271048/filePointer/17620414551238210/fodoid/17620414551238207/imageType/MEDIUM/inlineImage/true/118464-M%255B1%255D.jpg)
Jan