Railway signalling discussion

Jerviston Viaduct

British signalling of the past (UK, excepting Northern Ireland)

Jerviston Viaduct

Unread postby mossend4 » Tue Oct 15, 2013 11:46 am

This one has intrigued me since first sighting the remains of an old parapet on the north side of the South Calder Water many years ago while crossing the present-day Braidhurst viaduct (between Braidhurst and Jerviston Junction boxes on the main line north from Motherwell to Perth). The remains lay a few hundred yards on the east side of that viaduct.

NRM had a typo on its website - and also gave the wrong location for it - so it’s only in the last few years that I have managed to get proper information on it. Here’s the photo and corrected caption:- ... 17_SRX_395

It was also known by different names which didn’t help and the subject of my post is the 1845 signalling system and signals for controlling the single line over the viaduct, then called the Calder Viaduct, described in this Accident report. :- ... ct1856.pdf

When I first read it I had my 20th century signalling brain engaged and I’m sure I misunderstood the communication between the two ‘pointsmen’ – a bell connected by wire - as electrical. On further reading I’m equally sure it wasn’t.

The terms for operating the signals controlling entrance to the single line ‘red on’ and ‘turned off’ also make me wonder if these are elevated disc signals similar to McK&H signals discussed recently?
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