Might be better posting this question in the Skills and Knowledge PW and infrastructure section of the main forum as it will attract a larger readership than here in the blogs.

Hi Ed,

A lot of ground work signalling installations on the North Eastern Railway was contracted to McKenzie & Holland Co Ltd of Worcester who supplied the Type 17a slide tappet lever frames and many signal cabins were also to McKenzie specification. The point rodding I think you will find was 1 3/4" diameter round rodding which ran on stools set at 6' intervals, the rod stools were fitted with two curved rollers set in a frame for the rods to pass through, some rodding which pulled heavy points were solid bar whilst other rods which pulled lighter equipment such as FPL's and fouling bars were very often hollow tube. I think you will find the cranks had a 10inch throw whereas LNER / BR replacements had 12inch throws. The McKenzie point cranks had a much thinner centre boss than later replacement equipment, this was because the early post 1872 round rod installations were only pulling point blades of 85lb per yard weight whereas LNER rail was 95lb or 97lb RBS bullhead section which required the much stronger galvanized channel section. The downside with round tube rodding was it had to be painted to avoid corrosion which inevitably cause rot from the hollow insides and at screw connecting joints which weakened the integrity of such installations .

Hope this helps.

Paul

Try this:

http://www.clag.org.uk/green09.html

(all in later square section, but based on LNER)

Hi All thank you for your replies and in answer to your Dave john is my layouts based around 1956 and is based on settington on the MDR branchline and from the photo I can find it seems to be round ill see if I can upload the image.