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Central Line 92 Stock numbering

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adrock1976

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What's it called? It's called Cumbernauld
According to the Spotlog website that I have used to cross-check what 2 car units are required for haulage (with another recent lucky dip last weekend), I have noticed something strange regarding the numbering of the centre 2x2 centre cars (the ones numbered 92xxx).

It starts off with 92002 with increments of even numbers until 92266,, then there is a sudden illogical jump to 92402 then increments of even numbers ending with 92464. The cab units (91xxx) are in a logical order from 91001 to 91349 incrementing in odd numbers.

According to the Wikipedia page when I looked at it back in 2016, it mentioned that there are 85 trainsets, which would mean that there would be 170 each of the 91xxx and 92xxx. However, according to the Spotlog website having counted them, there are 175 lots of 91xxx and 165 lots of 92xxx in total. I am baffled here slightly on a couple of things.

1) How come there is nothing between 92268 upwards into the 923xx range?
2) How did the 924xx numbering range come about?
3) Is the Spotlog and the Wikipedia page right regarding the numbering range and the number of trainsets respectively?
 
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Peter Mugridge

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The 924xx are the ones with de-icing equipment fitted.

On the other point, yes there are a few more driving units than non driving units.
 

rebmcr

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And, the extra driving units are there to efficiently allow some 4-car operation without 'wasting' centre cars.

4-car operation of course has not been used for many many years, until its present revival on the eastern loop to free up diagrams for refurbishment.
 

Dstock7080

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4-car operation of course has not been used for many many years, until its present revival on the eastern loop to free up diagrams for refurbishment.
Except for Waterloo & City 1992 Stock have yet to operate as 4-car on the Central Line, if it actually goes ahead from Sunday
 

simple simon

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I'm not so sure that they can run 4 car units - too many places where the short trains are at risk of gapping.

Others here will know more than me on this topic.
 

MikeWh

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I'm not so sure that they can run 4 car units - too many places where the short trains are at risk of gapping.

Others here will know more than me on this topic.
I think 4 car running is only on the loop where there probably isn't much chance of gapping.
 

Dstock7080

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I think 4 car running is only on the loop where there probably isn't much chance of gapping.
Unfortunately trains have to reverse at Woodford and Hainault run into Hainault depot, which is where the test 4-car trains have already been gapped
 

simple simon

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Obviously track layouts and power rail positioning has changed since the days of 3 car trains!

2111_23.jpg
 

simple simon

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How difficult (and expensive) would it be to add extra power pick-up shoes to the handful of trains that will be used on the shuttle service?
 

Dstock7080

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1960TS isn't set up for automatic working on Westinghouse ATP
Correct
But they did operate automatically on the former system.
Therefore drivers were not conscious of being gapped as they had no control over stopping position
 

simple simon

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For a really wacko solution the trains could be converted to clockwork electric - using flywheels to provide a little extra movement when gapped! Its not a new idea - the Southern Railway had a few electric locomotives which were equipped with flywheels!

Admittedly though it would be new for London Underground, as neither the Met's nor the District's electric locomotives adopted this solution.
 
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