Double slips in the real world (LNER query)

Dog Star

Western Thunderer
This question is about prototype track formations rather than how we might build layouts in model form.

The subject is double slips with crossing angles of 1:6 for the LNER, that is, a formation designed and built by the LNER rather than something inherited from a pre-grouping company. Does such a beast feature in the standard works on the full-size railway, for example publications by the Permanent Way Institute. If such an item does fit into real-world track laying, what could be answers to these questions:-

1/ what size/type of switch is used with 1:6 crossings?
2/ where might the LNER have used 1:6 double slips?

thank you, Graham
 

Yorkshire Dave

Western Thunderer
Something like this I suppose. This picture turned up on the Templot Club !!?? :eek:

Unfortunately there's no note of location, time etc and I suspect this is a crop form a larger photograph.

double_outslip.jpg

A true Baseler double slip (below) probably didn't exist in the UK.
hd_dkw_bfovj.jpg
 

daifly

Western Thunderer
Dave
The Templot photo is an outside double slip which is a bit different to the 'normal' double slip anyway.
Graham
I'll have a look in the PWI volumes.
Dave
 

daifly

Western Thunderer
Well I've scoured both the 1956 2nd Edition and the 1993 6th Edition and both are very light on double slips! For LNER-specific info it might be best to approach the relevant specialist society. Sorry I can't help with more.
Dave
 

Eastsidepilot

Western Thunderer
According to the LNER, who's North Eastern Area prepared drawings in 1926 for the M.o.T. and a committee formed of rep's from the " Big Four"
double slips were only built as 1 in 8, 1 in 7 1/2 and 1 in 7 as standard units all with 'B' switches.

Col.
 

Dog Star

Western Thunderer
According to the LNER, who's North Eastern Area prepared drawings in 1926 for the M.o.T. and a committee formed of rep's from the " Big Four"
double slips were only built as 1 in 8, 1 in 7 1/2 and 1 in 7 as standard units all with 'B' switches.
Thank you for confirming the supposition.

What is the source of the information?
 

martin_wynne

Western Thunderer
The subject is double slips with crossing angles of 1:6 for the LNER, that is, a formation designed and built by the LNER rather than something inherited from a pre-grouping company. Does such a beast feature in the standard works on the full-size railway, for example publications by the Permanent Way Institute.

Hi Graham,

The LNER adopted the common REA designs after grouping, so 1:6 slips designed and built by them would be essentially the same as for the other companies (other than the GWR).

Standard designs were produced for the common sizes such as 1:7.5 or 1:8, but of course that doesn't prevent the design office producing a special where needed. Generally folks tend to be too wedded to using the standard pointwork sizes everywhere.

However, 1:6 is at the bottom end of the range for inside slips, and tricky to design and find space for everything. For shorter angles than that, an outside slip is much more likely.
If such an item does fit into real-world track laying, what could be answers to these questions:-

1/ what size/type of switch is used with 1:6 crossings?

For REA designs it would have been 1:24 deflection as for "A" switches, although I suspect they may have been modified to fit for a 1:6.

The GWR lists inside slips from 1:6 to 1:8 in 1/4 steps, but in that case using their old-type 10ft loose-heel switches.
2/ where might the LNER have used 1:6 double slips?

Well the obvious answer is wherever they needed one. If you have a 1:6 diamond-crossing and want a connection between the two roads, a 1:6 slip is what you get. However, 1:6 angles are not normally found in running lines, so a 1:6 slip would be most likely to be found in yards and depots.

regards,

Martin.
 

martin_wynne

Western Thunderer
According to the LNER, who's North Eastern Area prepared drawings in 1926 for the M.o.T. and a committee formed of rep's from the " Big Four"
double slips were only built as 1 in 8, 1 in 7 1/2 and 1 in 7 as standard units all with 'B' switches.

Well yes, but the operative words there are "prepared standard drawings".

Nothing to stop a local design office coming up with something different if they needed it.

Martin.
 

Stephen Freeman

Western Thunderer
This question is about prototype track formations rather than how we might build layouts in model form.

The subject is double slips with crossing angles of 1:6 for the LNER, that is, a formation designed and built by the LNER rather than something inherited from a pre-grouping company. Does such a beast feature in the standard works on the full-size railway, for example publications by the Permanent Way Institute. If such an item does fit into real-world track laying, what could be answers to these questions:-

1/ what size/type of switch is used with 1:6 crossings?
2/ where might the LNER have used 1:6 double slips?

thank you, Graham
I can't tell you where it was etc but in the Gauge 0 Guild On-line manual it is credited to R Chown Collection and states that it is "a semi-outside double slip in a goods yard"., not that that will help much of course. There are also other interesting prototypes in that section.
 
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