Mickey wrote: ↑Fri Mar 12, 2021 1:36 pm
LNER signalling at Finsbury Park 6 until the early 1970s
"The three search light colour light signals that were mounted on the lattice T bracket post just north of Finsbury Park 6 box and were applicable to the Up slow line the Up goods no.1 line & Up goods no.2 line were all three worked from individual (long handle) levers in the lever frame via a individual signal wire that ran from the box to a individual weight bar that was mounted on the lattice T bracket post in the same way as semaphore signals were. From the weight bar I believe a mechanical metal rod worked from the weight bar up to the individual search light heads to change the aspect so In warm/hot weather or in very cold weather the signal wire to the individual colour light heads had to be adjusted in the same way semaphore signals were adjusted either by tightening or slackening the individual signal wires. .... "|
Have you anything to back up the idea that these were " ....
rod operated from the weight bar up to the individual search light heads .... ", or indeed involved any mechanical operation above their weight bars, Mickey ?
You may know that the LNER's true mechanical colour-lights (using semaphore upper quadrant arm-type spectacle plates) could be, and many were, mechanically wire-operated up from their weight bars or motors.
And there were also searchlights that were mechanical to the weight bar, then a connected electrical contact box
(in some areas, called a 'circuit controller') electrically operated a conventional searchlight head mechanism, so there were no mechanical wires or rods up the post. The Down Main Starter at Three Counties was one of the latter, with the weight bar on a short wooden post in the cess of the Down Goods, opposite the signal which stood beside the DM
(goodness knows why it wasn't just fully electrically-operated; it was the plainest of signals - a 3-aspect with no other outdoor mechanical equipment working with it; and acted as Arlesey's Inner Distant).
I had always thought - possibly an incorrect assumption - that those three at FP No.6 were also of the latter, weight bar/contact box-at-the-bottom-of-the-post, type, and were wire-operated by long-handled levers only because of the co-acting det.-placer at the Up Slow signal (47 IIRC), and that the, up to three, facing points which both Goods roads' signals variously read through had mechanical detection in the signal wires.
I've a vague recollection that the Up Slow Home's lever was a very light pull, and so presumed that only a weight bar and the det.-placer were being operated, leaving the presumption that the signal head was electrically operated.
It would be good to have the correct details confirmed. If only we had a photo that showed sufficient detail of that 'T'-bracket signal structure to see whether there were any rods going up it, or only electrical cables.