Calamity Junction

[StevieG]

Yep.
There were more than a few dotted about.
The disc out of the down Dock at Hitchin Yard was yellow, as was (according to the box diagram), the miniature semaphore arm there in the up yard, which only read out onto the to Up Slow.

Not sure about Langley without checking (which I can't for quite a while).

I think there were one or two at Welwyn North, but all had gone before I got there.

One or two at places like Barnet North, Fins.Park No.1, and you're right - 231 at Kings Cross was a yellow electric disc; the outlet signal from the Passenger Loco 'departure' Spur to Down Slow, Main 2, or Main 1; having to be passed in the 'On' position to go 'straight' ahead into 'the elephant house' shed.

[R. pike]

We are wandering away from topic but Hitchin South as shown in the earlier link does posses a strange bit of locking. Does anyone know how train from the up main got into the farm(engineers sidings)?

[Mickey]

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[StevieG]

Oops Micky!
At Hitchin Yard, it must also have been the case that the dolly facing the other way on the same down side road, and reading from the goods shed across the long-ish crossover to the Up Fast (slips in the Down Slow and D.Fast), would have been a yellow.

[Mickey]

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[StevieG]

Micky,
Managed to have a look at notes of Langley box after all.
It was a yellow dolly out of the Up Sidings, but only after the big alterations there in about 1968(?) in connection with Stevenage South being abolished.
Before then it had been a red one, despite having to be passed at Danger to shunt up the spur.

[Mickey]

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[StevieG]

Well Hertford must've been about 1923/24, and WGC around the same time (?), so presumably no surprise if they were similar.
Not sure when Langley structure dated from : Would've assumed a bit earlier (1915-ish?), when superseding the old Langley ('sidings') box, in connection with the building of the 'loop' line from Cuffley to here.

[ All this is nothing to do with the 'Calamity Junction' test though.]