When do you think it will be outdated to release 2024 tube stock into service regarding train technology

[Silent]

I was just wondering this because in the past 1938 tube stock and 1962 stock were around 24 years apart yet seem similar. I have only rode the 38 stock on a 38 stock tour day and found the trains really loud and bouncy. I only have brief memories of using the 83 ts but it looked similar, although more refined and advanced, than the 67 ts. It’s tube stock from the 90’s to 00’s that seemed to advance rapidly although it seems like maybe the evolution of train design has slowed down again. I’m not sure about the technical side. I know newer trains are probably more efficient than a train from the 10’s that that outdates a 2010 design being released now.

 

[bramling]

I was just wondering this because in the past 1938 tube stock and 1962 stock were around 24 years apart yet seem similar. I have only rode the 38 stock on a 38 stock tour day and found the trains really loud and bouncy. I only have brief memories of using the 83 ts but it looked similar, although more refined and advanced, than the 67 ts. It’s tube stock from the 90’s to 00’s that seemed to advance rapidly although it seems like maybe the evolution of train design has slowed down again. I’m not sure about the technical side. I know newer trains are probably more efficient than a train from the 10’s that that outdates a 2010 design being released now.

If you look at Tube stock, from 1935 to 1983 is essentially a fairly continuous evolution.

The 1986 prototypes were the forerunner to what was essentially a new generation, though concept-wise it was just a heavily updated version of what came before. The 96 stock was a development of the 92 stock (remember that the 92 stock was originally going to be 90 stock, and was based on elements tested in the prototypes, so you could argue that the 96 stock was coming on for a decade more advanced). The later 95 stock was essentially based on the 96 stock but managed to iron out a lot of this stock’s niggles.

In many ways the 09 stock is the odd one out. In some ways it’s the end of the long line which ultimately dates back to 1935, but in other ways is a heavily updated 92 stock rather than lending itself to the 95/96 stocks, especially in terms of appearance - though remember that the 95/96 stock were supposedly designed to resemble the ill-fated 83 stock.

If you look at the 92-09 stocks, in terms of propulsion systems at least, 92 stock represents a generation, 96 stock another, and 95/09 stocks another. I don’t claim to know much about the 24 stock, however one wonders just how much the propulsion system has advanced since the 09 stock.

Of the current Tube stocks, a shout for the 95 stock. After a slightly rocky start they quickly settled down to give solid service, and have coped well with whatever has been thrown at them, not least the punishing Thales ATO system, night running, and also extending to Battersea without expanding the fleet size. Like most LU stocks they have dipped a bit this decade, but still perform very respectably well, and still maintain a reputation that “these trains don’t really break down”. It will be interesting to see how the 24 stock compares.