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topic: 1308Max unsupported rail length
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posted: 16 Dec 2010 12:39

from:

richard_t
 
Nr. Spalding, South Holland - United Kingdom

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Hello

I wondered if there was a maximum length of rail that was permitted without support from a chair and sleeper/timber? I've got a few complex junctions that I'm shoving timbers around but I keep ending up with biggish gaps between them.

TIA.


edit: Company is CLC (according to the plans I have the LMS took over the infrastructure). Bullhead practice from the 1930s.
Last edited on 16 Dec 2010 13:48 by richard_t
posted: 17 Dec 2010 07:42

from:

Jim Guthrie
 
United Kingdom

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richard_t wrote:
Hello

I wondered if there was a maximum length of rail that was permitted without support from a chair and sleeper/timber? I've got a few complex junctions that I'm shoving timbers around but I keep ending up with biggish gaps between them.

TIA.


edit: Company is CLC (according to the plans I have the LMS took over the infrastructure). Bullhead practice from the 1930s.
Richard,

The widest pitch of sleepering/timbering I have seen is in a drawing of a Caledonian interlaced diamond where the sleepers were pitched at 42".   I've also seen photographic evidence of spacings like this where you can make a fairly accurate estimate of the sleeper spacing by reference to objects of known dimension,  like locomotive or rolling stock wheels.   These would have been the standards in force in the late Victorian period where locomotive and rolling stock weights would be a bit less than those which applied in the 20th century.  Another factor which applied in Caledonian track was the use of interlaced sleepering which could force wider sleeper pitches purely by the laws of mathematics. :)

Jim.

posted: 20 Dec 2010 13:11

from:

richard_t
 
Nr. Spalding, South Holland - United Kingdom

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Cheers Jim, I'll probably keep to around 27" centers, but it's good to know that I can go wider if need be.



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