On doing some research, I found very little information regarding spacing between two parallel tracks for either Sub-surface or deep-level LU on open sections. Is there a standard track dimension that is adhered to. Also, would this apply to Depots, if not, then what sort of spacing is commonly used for them. I'm currently looking for details so that I can design a track layout for a Model Railway Layout.
Countryman is correct. 'Four Foot' is the nickname for the 4' 8 1/2" gap between the running rails. The 'six foot' and the 'ten foot' are actual measurements for the gap between adjacent running lines and between a running line and an additional running line or siding. They are shown in the Ministry of Transport's 'Requirements for Passenger Lines and Recommendations for Goods Lines in Regard to Railway Construction and Operation' (know as the Blue Book) available at www.railwaysarchive.co.uk/documents/MoT_Requirements1950.pdf. There is a coloured diagram at the end of the booklet.
Thanks countryman . The 6ft gap is what I'm after I think. I'm also curious as to what sort of space is left between roads at Depot's. It looks like a 7-8ft spaces. I guess there's always an element of guessing involved when it comes to modelling track plans.
Are we looking for the actual dimentions? Gauge is 1435mm standard but can be less (through P&C) or more (tight radius curves). The 6ft to NWR standard should be a minimum of 1970mm (thats running edge to running edge). I have known it to be less than this (straight track) or to be much more (tightly curved track to account for overthrow and cant). Depot roads have the same minimum as running lines, they shouldnt be closer just because its a depot. I havn't surveyed a depot road before so I wouldnt be able to give an example of the clearances. Hope this helps!
If the OP is transposing these to model railway use, if using 00 gauge, don't make the mistake of using 24mm for the six foot, it won't work as stock will hit on curves! True track gauge in 4mm/ft is 18.83, not the 16.5 we use. so the six foot needs to be a couple of mm wider. Minimum for 00 gauge between track centres is about 43mm, but most modellers use 50mm for convenience.
True track gauge in 4mm/ft is 18.83, not the 16.5 we use.
Indeed - to 4mm/ft scale (I love mixed metric/imperial units) 16.5mm tracks scale to about 4' 1.5". The background to this anomaly was the desire back in the 1920s to use existing continental HO (3.5mm/ft) track and motors for UK-style models. However, British trains have a smaller loading gauge than continental ones so when scaled down to 3.5mm/ft they were not big enough to take the motors designed for HO models of continental-gauge rolling stock. So UK manufacturers went for 4mm/foot scale models. Big enough for the motors to fit, and not too big to fit through bridges etc designed for HO models. But they still used HO track, which was thus under-scale. Not just track, but HO scale houses, people etc look a bit on the small side if used on an OO layout (a model person who looks 6ft tall on an HO model looks only about 5'3" in OO).
HO stands for half-O scale: Frank Hornby marketed the OO scale as Double-O - hence Hornby-Dublo.