Very unlikely as that would imply they are locked by the Block/Token instrument.
Keith, Once again this is really kind of you. I'll try to not come up with too many supplementary questions.
Tony
Very unlikely as that would imply they are locked by the Block/Token instrument.
Tonycardall wrote:... I'll try to not come up with too many supplementary questions.
Tony
Tonycardall wrote:2. Do you think that signals 14, 19 and 22 should be yellow? IE. authorised to pass without being cleared providing you are not taking a route that would require the signal to be cleared. I'm paraphrasing as I don't have a rule book to hand and I don't know if that method was used in those days.
JFS wrote:Not sure this got answered ... it is my understanding that the GW did not use yellow arms in this situation but the spectacle glasses were clear rather than red.
Tonycardall wrote:Keith, Once again this is really kind of you. I'll try to not come up with too many supplementary questions.
Tony
Noel wrote:BR(WR) used a yellow arm on white disc, and yellow and green aspects, for conditional ground signals, but I don't know when the change took place; it was not retrospective, so such signals were not very common.
JFS wrote:Not sure this got answered ... it is my understanding that the GW did not use yellow arms in this situation but the spectacle glasses were clear rather than red.
BR(WR) used a yellow arm on white disc, and yellow and green aspects, for conditional ground signals, but I don't know when the change took place; it was not retrospective, so such signals were not very common.
Early 1950s but, as Noel implies, they were only used for new works or necessary replacements so they were never very common.
The GWSG Book on "GWR Signalling Practice by D.J.Smith" mentions the use of Ground Shunt Signals with Clear & Green Aspects and Red Arm on White Disc for movements in normal direction of travel.
To save the time creating a parts list and you from trying to source in small quantities where the costs are inflated and postage added I can just pick the relevant bits from my spares and assemble a relay board for you.
bécasse wrote:Not only had the other three grouping companies used them from c.1930 but they also (gradually, money was short) introduced them for relevant existing installations, changing red dollies to yellow ones.
Tonycardall wrote: I will have to do some more research as I suspect that there would be instructions that the signaller would need to come to a clear understanding with the shunting staff when intending to move points giving access to the yard/sidings where shunting takes place.
Tonycardall wrote:I'm intrigued by 'normal direction of travel'. I can see why that would be as a driver would not wish to encounter a red aspect when running on the main line but, does this mean that 'wrong direction movements would have a red in place of clear? Another can of worms that I'm sure I can find the answer to.
The GWR had a specific signal for backing movements, where these were common, a small red arm with two holes in it
Tonycardall wrote:I'm intrigued by 'normal direction of travel'. I can see why that would be as a driver would not wish to encounter a red aspect when running on the main line but, does this mean that 'wrong direction movements would have a red in place of clear?
I will use Red/Green aspects on all Ground Shunt Signals with the exception of the Loop access which will be White/Green as described earlier.
Regards
Yard to Up line is not a "wrong direction" or "backing" movement
PM with address will sort it.
So, it is wired up (albeit temporarily for test purposes), and works perfectly.
Pannier Tank wrote:Could either of you please advise what the Max Throw is for the Top Take-off Clevis and Bottom Take-off Clevis is please?
JFS wrote:The throw of the top clevis is 16.5mm (intended to give 15mm after some losses in a rodding run). The bottom take-off gives a max of 6.25mm (intended to give 5mm after losses)
Hope that helps,
I'm looking into Building an Electro-Mechanical Interlocking Frame using Servos for the Locking
Tonycardall wrote:I'm looking into Building an Electro-Mechanical Interlocking Frame using Servos for the Locking
David,
Good Luck. I hope that you will post your progress for the benefit of all!
Regards,
Tony
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