timbowales
Western Thunderer
Yes, the driver's positioning of the loco is spot on!Absolutely agree about the clan photo!
Yes, the driver's positioning of the loco is spot on!Absolutely agree about the clan photo!
An unidentified A3 believed to be at Potters Bar during a cold December 1962.
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Hmm! Not so sure. Looks like a SPAD to me…..Yes, the driver's positioning of the loco is spot on!
When we saw a suspected SPAD at Gilling 5 inch yesterday a friend suggested that as long as the driver can see the signal from the cab it is not a spad, and he is well clear of that gantry.Hmm! Not so sure. Looks like a SPAD to me…..

Need an operator to advise. I think that if any part of the train is beyond a stop sign it is a SPAD. Usually won’t be picked up by the signalling as the section track circuit will usually (?) extend past the signal for a short way.When we saw a suspected SPAD at Gilling 5 inch yesterday a friend suggested that as long as the driver can see the signal from the cab it is not a spad, and he is well clear of that gantry.
Paul
As a retired Signalling Engineer a SPAD would only be detected when the first track circuit beyond the signal was occupied. There was a Scottish peculiarity that caused me extreme difficulty on one alteration. Scottish Region practise was that they did not use first wheel replacement, i.e. the first track circuit being occupied puts the signal back to danger. Instead it was either the third track occupied or berth track unoccupied!Need an operator to advise. I think that if any part of the train is beyond a stop sign it is a SPAD. Usually won’t be picked up by the signalling as the section track circuit will usually (?) extend past the signal for a short way.
I worked with the man in charge of the BR steam specials post 1968. He had been a driver from Nine Elms. I asked him if he had ever had a SPAD. Three was the reply, but none detected. All due to ‘youthful experience’.
The other pearl of wisdom I got from him was the comment that ‘if a Merchant was an 8, a Duchess was a 10.’

And stopping within the overlap was the thinking behind TPWS. I was lucky enough to lead the team that developed the concepts for this.There are many SPADs each year, but most have little or no potential to cause harm because they are the result of minor misjudgements of distance or braking capability, or they occur at low speed. In most cases, the trains stop within the safety overlap provided at the signal.
We were on a Gatwick( I think, or Redhill) to Brighton train a few years ago, when the train stopped at Three Bridges, where it wasn't meant to stop. The front coach had gone past a signal, that according to the driver, had turned from green to red**, as the train approached it, without enough braking distance to stop. His explanation on the PA was more than a tad emotional.I would argue with Tim from a pedantic point of view. A SPAD is most often highlighted by track circuit occupancy, but it doesn't have to be, theoretically simple physical observance is all that is necessary to generate a Form 1. In this respect Genghis is correct, if a train passes the line across the track presented by a signal at danger then it is a SPAD, there may well be mitigating circumstances. On that basis the Clan was most definitely a SPAD, we've all seen it.
I don't think last wheel replacement was peculiar to the ScR, any location where trains were assisted in the rear usually had this so that the driver of the trailing locomotive didn't pass a signal at danger. From my observation these days in more recent installations the insulated joint or axle counter location is often a train length in advance of a signal, thereby saving a separate overlap .
Two comments from the ORR on SPADs, the second of which is pertinent to the Clan, the difference of course being that it is nowadays much more reported.
A signal is passed at danger (SPAD) when a train passes a stop signal when not allowed to do so.
There are many SPADs each year, but most have little or no potential to cause harm because they are the result of minor misjudgements of distance or braking capability, or they occur at low speed. In most cases, the trains stop within the safety overlap provided at the signal.
The balance weights on the driving wheels are certainly in a different place, so perhaps it’s on the move?Hasn't 72002 Clan Campbell at Carstairs moved forward of the signal gantry in the second photo - since being stopped right up to it ??
The signal is now off too, so yes.The balance weights on the driving wheels are certainly in a different place, so perhaps it’s on the move?
Regards
Dan





