Talk:London Bridge – Greenwich Railway Viaduct

Semi-circular arches
At least some of the "851 semi-circular arches" are in fact segmental, as evidenced by the photographs. —MegaPedant 01:21, 13 November 2010 (UTC)
 * Could these be covered by the "road bridges" mentioned in the quotation? However, I am no engineer and was merely quoting Turner when I wrote the article. If you can improve it with appropriate wikilinks please go ahead and do so.--Das48 (talk) 08:59, 13 November 2010 (UTC)
 * Some could, I suppose, for example the arch over Bermondsey Street. However, the arch containing Spa Road station is also segmental, as can be seen from the photograph, so I'm afraid the answer seems to be no. I'm really not sure what is meant by a "road bridge" in this context: well, clearly an arch that spans a road might be referred to as a road (under)bridge, but railway viaducts do span roads, rivers, canals, etc. and usually there's no distinction as to what a particular arch spans. Perhaps in the context of this particular structure a "road bridge" is actually a girder bridge and not an arch at all, given that the structure as a whole is made up of several viaducts. Furthermore, skew arches can also be semi-circular (by this, I mean that being one doesn't preclude the other) or segmental (again, Bermondsey Street is an example) or, indeed, elliptical or three-centred. It's certainly a complex structure and I haven't studied it in great detail. —MegaPedant 01:46, 17 November 2010 (UTC)

Units
Where the undefined undefined template is used I've made the following changes so please discuss if you disagree: —MegaPedant 01:56, 17 November 2010 (UTC)
 * for distances in miles, I've changed from metres to kilometres as the metric equivalent
 * for distances in feet, I've left the metric equivalent in metres
 * only one use of the "sing=on" parameter was correct ("leading to its own 800-foot (240 m) viaduct", which I've left), for all the others I've removed it and thereby removed the errant hyphen between the number and the unit of measurement (e.g. "a single structure 3.45-mile (5.55 km) in length" is now "a single structure 3.45 miles (5.55 km) in length", which is correct).