The Downstream Bridges and Railway Bridges of Windsor
The Bridges of Windsor across the Thames. The downstream bridges and railway bridges. The ThamesWeb Windsor History site -
http://www.thamesweb.co.uk/windsor/windsorbridges/bridges2.html

English versus American Bridges
Discussion on the merits of English and American iron bridges. Published in the 1874 edition of the Railway Gazette.
http://quod.lib.umich.edu/cgi/t/text/pageviewer-idx?c=moa;cc=moa;rgn=full%20text;idno=AJR3197.0001.001;didno=AJR3197.0001.001;view=image;seq=00000001

New Zealand Railway Bridges
Descriptions and photographs of viaducts categorized by size.
http://trains.wellington.net.nz/bridges.html

Trans-Siberain Railway
Ôîòîãàëåðåÿ Òðàíññèáèðñêîé ìàãèñòðàëè è âîñòîêà Ðîññèè
http://www.transsib.ru/Gallery/index.php?CATEG=03BRI&REGION=&TAKENON=&DIR=&LINE=&AUTHOR=&DESCR=&HOWMANY=20&NCOLS=2&LNG=EN&SHORT=

Voronezhstalmost ZAO
ÂÎÐÎÍÅÆÑÒÀËÜÌÎÑÒ ÇÀÎ - èçãîòîâèòåëü ìîñòîâûõ è ñòðîèòåëüíûõ ñòàëüêîíñòðóêöèé. Îôèöèàëüíûé ñàéò. VORONEZHSTALMOST ZAO - Russian fabricator of steel structures for bridges, civil and industrial engineering. Official site.
http://web.vrn.ru/stlmst

Modern Examples of Road and Railway Bridges
Facsimile of the book which he authored jointly with William Maw. Also available in pdf and tiff formats.
http://bridges.lib.lehigh.edu/books/book1321.html

Long and Short Span Railway Bridges
Facsimile of the book wriiten by Roebling in 1889. Also available in pdf and tiff formats.
http://bridges.lib.lehigh.edu/books/book1831.html

Chepstowe Bridges
Illustrated history of the stone arch bridge designed by Rennie, and Brunel's railway bridge.
http://www.striguil.co.uk/chepstow/bridges.htm

Trans Canada Wood Products Ltd.
The Trans Canada Group of companies are manufacturers of white cedar acoustic and privacy fencing, treated and untreated utility poles, tie plugs, and wooden bridges.
http://www.transcanadagroup.on.ca

Jock Valley Engineering
Engineering services relating to railway infrastructure including crossings, tracks, bridges & signals.
http://www.jockvalley.com/