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Old 26-12-2017, 04:33 PM   #1
stevenfitch
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Default What is this?

Ive had this on a shelf in my office for a while now, it was in my grandads attic with his OO Gauge railway (just sitting there, not doing or indicating anything).

If you tilt it from side to side the red signal head moves but then always comes back to 'out of order'.

(p.s I know what a pen is, that's just there to give a sense of scale)







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Old 26-12-2017, 04:59 PM   #2
twalton1145
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Hi there, looks like something for Antiques Roadshow - could be worth a bob or two?

ted
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Old 26-12-2017, 05:28 PM   #3
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Not sure if this will help, looks very similar.

Railway Signal box home signal repeater.

Or this

Signal repeater instrument
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Old 26-12-2017, 05:38 PM   #4
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A block instrument indicator. Signalmen will be able to tell you more. Also, some smaller versions were made by modellers to replicate the workings of a signalbox.
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Old 28-12-2017, 10:04 PM   #5
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Quote:
Originally Posted by Gareth 73 View Post
Not block instruments but Excactly like mr bones first link. Its a signal repeater for indicating the state of sigal remote from the box. Out of order indicates the signal is showing an incorect indication or the detection not working. If it should b at danger when showing out of order then theres a good chance the wires too tight (gone cold out). If it should b off then good chance wire too slack (gone warm out). Theres an art to getting an adjuster right which i no longer have to worry about sat in front of a computer screen playing wat amounts to simsig.
Excellent thanks for the help, my grandad used to work in signal boxes near where i live so thought it may have been 'borrowed' when they closed the line down.

Not sure if i should just keep it on the shelf or try some elaborate means to make it work again in the signal box (garage) of the garden railway...
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Using Digitrax hardware with RR&Co TrainController.

OO Gauge DC with some automation (now no longer)
Automated N Gauge Loft Layout (now no longer)
Automated G Scale Garden Railway (current)
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Old 29-12-2017, 11:27 AM   #6
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It is indeed a very early signal box signal arm indicator. It sits at "Out of Order", or "Wrong" as other regions use that term, as there is no power to the mechanism. It would have around 6 to 12 volts DC applied one way to make it show Signal arm On (Danger - Stop) and the opposite way for it to show signal arm Off (Proceed). In real operation the unit would sit on the signal box block shelf.
It works via usualy a bank of very large 1.5volt dry cells which were housed in a wooden battery cupboard at the base of the signal or very close by and the bank of batteries are centre tapped to enable reversal of the supply. The signals arm is mechanically linked to a switch called a 'Controller' mounted at the top of the signal next to or close to the signal arm and this controller provides the switching to show the signal On or Off electrically by simply reversing the polarity in one of the feed wires going back to the signal box indicator. The other feed wire connecting to the centre tap on the battery. Sometimes the centre tap one was via earth (ground) rather than use two wires. If the arm is not correctly in the On or Off positions it will not have any power feeding out as the contacts inside the controller are not making connection to the feed wire and the indicator will show as now - Out of Order or wrong.
Other regions, possible in later time period installs on that units area too, a much smaller circular brass and later black bakelite 'Instrument shelf facia mounting indicator' is used. Usually with a white background black lettering and black pointer that swings to the left or right to show On or Off and the pointer hangs down in the middle vertical position for Wrong. Distant signal indicators are usually black background with white lettering.
A further type of indicator was the lamp lit indication. Paraffin lamps were used to light the signals and if the signal was out of the signalman's view an indicator would be used. Worked by a simple Bi-metal strip heated by the lamps flame.
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