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| London Transport (uk.transport.london) Discussion of all forms of transport in London. |
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#5
September 3rd 04, 06:54 PM
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LUL track gauge not the same as BR gauge?
In article ,
James wrote: (Boltar) wrote in message . com... I was reading a book by Brian Hardy about the tube trains on the Isle of Wight and he states that the LUL track gauge is 4 foot 8.75 inches but the BR gauge is 4 ft 8.5 and that this caused issues initially. Is this a true statement (perhaps he was misinformed?) as it seems amazing to me and if it is does it cause any operational issues on shared tracks such as on the Bakerloo and Met? B2003 Regular 4'8½" gauge track actually varies in gauge between 4'8¼" and 4'8¾" depending on track curvature. If you think about it, this difference of half an inch between minimum and maximum is actually a quarter inch on either side - a wholly insignificant amount. If stock which has wheels ¼" further apart tries to run on such rails, there are likely to be no problems, although they may end up riding on the wheel-flanges. As to whether that statement is true, I have no idea. Official track gauge is normally specified in mm. As I recall, the BR track gauge was actually changed a few years ago by a few mm. I think it changed from 1438mm to 1435mm (or maybe the other way around) for nominally straight track. It was something to do with the slight variations in the preferred rail head and flange profiles, both of which tend to change with wear. Gauge widening is only significant on sharply curved track. David |
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