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PostPosted: Sun Apr 29, 2018 12:37 am 
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Joined: Tue Oct 13, 2015 9:33 pm
Posts: 12
Location: Waikanae, New Zealand
Can anyone help with the year in which the Rule 55 exemption diamonds (perhaps more accurately "squashed hexagons"?) came into use? I've seen plenty of photographs showing them on LNWR semaphore signals in the BR and late LMS periods, but can't recall seeing them in photographs from the pre-grouping era.

I'm working on the assumption that I would be correct in placing them on selected signals on my 1935-40 LMS Western Division layout, but stand to be corrected.


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PostPosted: Tue May 01, 2018 3:39 pm 
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Joined: Sat Jun 10, 2017 9:47 am
Posts: 6
I have looked up the information in 'A pictorial record of LMS signals' by L G Warburton. He states that the sign was designed by W C Acfield of the Midland Railway in 1915, probably as a response to the serious accidents that company had suffered at Ais Gill and Hawes Junction. The use of it across the whole of the LMS was decreed by A F Bound in 1929. He was the LMS Signal and Telegraph engineer form April 1929.


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PostPosted: Tue May 01, 2018 8:11 pm 
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Joined: Tue Oct 13, 2015 9:33 pm
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Location: Waikanae, New Zealand
Thank you Tim. The information is exactly what I was looking for. You've also convinced me to track down a copy of Graham Warburton's book. Richard Foster's companion volume on LNWR signalling is one of my well-thumbed "bibles", but I don't have the Warburton book in my library.


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PostPosted: Thu May 03, 2018 7:58 am 
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Joined: Sat Jun 10, 2017 9:47 am
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I have a copy of the original edition which I bought when it was published for £1.00. I believe it has now been republished as a paperback for about £15.00, which I suppose is not too bad a rate of inflation. The reference for the new edition is ISBN: 9781906419417


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PostPosted: Thu May 03, 2018 10:06 am 
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Joined: Tue Oct 13, 2015 9:33 pm
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Location: Waikanae, New Zealand
I tracked down a first edition hardback on AbeBooks. It is now on its way to me here in the Antipodes - at a total cost of rather more than 15 pounds I regret to say!


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PostPosted: Fri May 04, 2018 7:48 pm 
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Joined: Sun Oct 23, 2011 4:19 pm
Posts: 337
I concur. I believe the first companies to have the diamonds were the MR, and I think the GN, in about 1913. In fact these were notified in the LNWR NN&P District weekly notices for 1913 - and in contemporary WTTs.

The LNWR was not far behind, clearly.


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