Deleted
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Post by Deleted on Nov 14, 2008 8:44:17 GMT
Hi All,
I'm just wondering what sounds would have been heard in the standard 1923 tube stock cab on acceleration and deceleration.
There must have been clunking of the relays coming in and out.
Did they all bang in together then drop out one at a time or did an individual relay bring resistance in and out one at a time.
Either way, I would of thought these were audible to the driver and maybe from the outside aswell.
Darren.
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Deleted
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Post by Deleted on Nov 14, 2008 10:17:59 GMT
I don't know what it sounded like in the cab, but there were plenty of noises if you sat near the equipment compartment of a driving car.
The loudest was the air compressor, which was obviously piston rather than rotary, as you could hear the chuffa-chuffa-chuffa. A very distinctive sound, which would cut in as the train came to a stand, run for maybe 20 seconds, and then the power would be cut off and the pump would slow down and take a second or so to stop.
As I recall, the relays were quite quiet, but there was a click at each notch.
Hope this helps!
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slugabed
Zu lang am schnuller.
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Post by slugabed on Nov 14, 2008 10:37:39 GMT
Are any of the Isle of Wight standard stock units preserved? Or are there any still in service,or were they all replaced by 1938 stock?
It'd be a real shame if they'd all vanished without trace....
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Deleted
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Post by Deleted on Nov 14, 2008 11:25:29 GMT
None in service, but some cars were re-imported to London in time for display at the Morden Depot Open Day in 1990. They're now part of the museum collection with the original intention of eventually making a 'heritage train' for special outings, but I'm not sure what the current status of that is.
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Deleted
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Post by Deleted on Nov 14, 2008 12:15:08 GMT
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neilw
now that's what I call a garden railway
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Post by neilw on Nov 14, 2008 13:12:56 GMT
from what I recall as a kid on the Central Line, the contactors could be quite noisy, especially the line breakers as power was first applied. I also recall the whole experience being quite rough compared to the 59/62 stock which followed. I had forgotten about the compressors, the sound was very distinctive, especially the way they slowed down if they were running and the train pulled away!
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Post by ribaric on Nov 14, 2008 14:02:58 GMT
The acceleration contactors were air operated and closed in sequence under the control of a PCM (Pneumatic control mechanism) - a fore-runner of the RPA notching camshaft. Each air valve had a loud 'clunk' to denote each section of traction resistor being bypassed. One thing of note, the PCM equipment was notoriously bad at detecting rail gaps so drivers would shut-off and coast over these before re-accelerating. If they didn't, full line voltage would be applied once the shoes picked up on the other side of the gap, sometimes with a dramatic arc and resultant mini explosion.
The compressors were always operated independently of the motors, being under the control of a pressure governor but would often cut in at station stops to replenish the air used by the brakes.
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Deleted
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Post by Deleted on Nov 14, 2008 16:21:06 GMT
I just checked out the Pathe News website and they have a few clips containing the Standard Stock. Shame some bloke's always talking over the top of them with the band playing I can't here anything.
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Post by astock5000 on Nov 14, 2008 17:01:08 GMT
None in service, but some cars were re-imported to London in time for display at the Morden Depot Open Day in 1990. They're now part of the museum collection with the original intention of eventually making a 'heritage train' for special outings, but I'm not sure what the current status of that is. Some cars are in the LTM depot at Acton, and the others are at Acton works. Someone said that they might have to go to make room for a 4-car A stock. |
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Post by tubeprune on Nov 14, 2008 18:39:32 GMT
The acceleration contactors were air operated and closed in sequence under the control of a PCM (Pneumatic control mechanism) Er, no, they were electro-magnetic on Standard Stock. There was no air operation on Standard or Q Stock. The air operation was limited to the T Stock and the sleet locos which got T Stock contactors. The Standard Stock would go through a gradual "clack-clack-clack" sequence as the train accelerated but they would all drop out together with a loud "plop" when you shut off or went over a gap. As you got current back, they would quickly ramp up with a rapid "clack-clack-clack" again. The PCM was only introduced on the 36 and 38s. |
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Post by ribaric on Nov 14, 2008 20:21:01 GMT
Oops! I was assuming the ESLs got their kit from the standards. The bit about shutting off over gaps came from the old guys who continued the habit even after 62s had arrived. I would get a proper rollocking from my trainer if I kept the handle open over gaps - not that understood why at the time.
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