I have now completed the design for a Saxby & Farmer 19ft bracket in 4mm scale.
These were widely used throughout the UK and especially on the Southern Railway. Similar Brackets were used at Seaton Junction, Wadebridge and Halwill Junction to name but a few.
Those wanting a shorter bracket should go to Wizard Models and search for S0021. I would have used it myself but it was not big enough. Price is £3.00 UK Post paid.
A 7mm version is currently being worked on together with other Brackets etc.
Etched Brass Model Railway Signal Brackets