2024 Tube Stock (Siemens Inspiro London)

[Silent]

Not sure it’s a completely fair comparison as they’re not on the same track.

Maybe, I have to watch more clips to observe.

 

[100andthirty]

50 years of design progress, flexible bogies and air suspension compared with box bogies on double chevrons, I'd hope so!

The 2024 tube stock doesn't have air suspension. It has coil primary springs (a first for the Tube) and double hemisphere rubber secondary springs (as are used on 1996 tube stock and formerly on D stock and refurbished C stock). As to flexible bogie frames, all bogie frames are flexible to a greater or lesser extent. I doubt that the 2024 tube stock bogie is any more flexible than that on 1973 tube stock, and it certainly doesn't have flexible joints such as used on 1995/2009 tube stock and S stock

 

[Silent]

The 2024 tube stock doesn't have air suspension. It has coil primary springs (a first for the Tube) and double hemisphere rubber secondary springs (as are used on 1996 tube stock and formerly on D stock and refurbished C stock). As to flexible bogie frames, all bogie frames are flexible to a greater or lesser extent. I doubt that the 2024 tube stock bogie is any more flexible than that on 1973 tube stock, and it certainly doesn't have flexible joints such as used on 1995/2009 tube stock and S stock

According to Google it’s more advanced, but then tube bogies seem louder than national rail stock usually. I wonder if the parts being more joined to the body than bogies with new train stock makes a difference to how it bounces on the track as it makes a difference to how the weight is spread from bogie to track.

 

[100andthirty]

There is no doubt that the 2024 tube stock bogie is more advanced than the 1973 tube stock bogie. The latter is based on the design originally used on the 1956 tube stock from 70 years ago, so it's hardly surprising. The 2024 tube stock design:

".....will be inside frame type, with a wheelbase of 1.80m using radial arm wheelset guidance supported with coil spring primary suspension. The radial arm’s bushes will be of variable stiffness to allow a modest amount of passive radial steering. The secondary suspension will use rubber hour-glass-shaped springs, previously used on several LU fleets. Hydraulic dampers will be used on both suspension stages. There will be single tread-brake units per wheel for brake blending, backup in case of dynamic brake failure and for emergency brake applications. There will be space for shoes, tripcocks, sleet brushes, wheel flange and wheel tread lubrication, and CBTC antennae. Although the individual axle loads will be higher than usual due to the articulated layout, modelling has shown that the bogie’s running stability will be improved, making it much more track friendly than any previous LU bogie."

quoting from a Rail Engineer article in the May/June 2021 issue.

 

[torontoaddick]

Saw a 24TS running in traffic hours on Thursday evening at Hammersmith, train 747 with 48030 leading.

 

[Silent]

Not sure it’s a completely fair comparison as they’re not on the same track.

Just watched a video where I think the 2024 stock was on the same section of track as the 1973 stock but doing an emergency stop. I noticed the bogie noise had less echo sounds compared to the 73 stock. I’m not sure if it’s much quieter though.

Idk if I am wrong here but sometimes the tone of the bogie sounds remind me a bit of the 96 stock.

 

[Dstock7080]

Saw a 24TS running in traffic hours on Thursday evening at Hammersmith, train 747 with 48030 leading.

Paths are now available for empty late evening test runs, from Northfields depot to Barons Court siding and back. So you may witness one after 22.30 Mon-Thur evenings. These are not guaranteed to operate.

Also, to aid testing during cancelled engineering hours and planned closures, the tunnel mounted 24TS stopping markers will be permanently illuminated from 28 October. The are located all stations Earl’s Court-Arsenal, Hatton Cross WB pfm.2, Wood Green WB pfm.2.

 

[Momodou2003]

Paths are now available for empty late evening test runs, from Northfields depot to Barons Court siding and back. So you may witness one after 22.30 Mon-Thur evenings. These are not guaranteed to operate.

Also, to aid testing during cancelled engineering hours and planned closures, the tunnel mounted 24TS stopping markers will be permanently illuminated from 28 October. The are located all stations Earl’s Court-Arsenal, Hatton Cross WB pfm.2, Wood Green WB pfm.2.

That’s good do you know when paths will open for them to start test runs during traffic hours in the day or is still not confirmed yet?

 

[Dstock7080]

That’s good do you know when paths will open for them to start test runs during traffic hours in the day or is still not confirmed yet?

there will be more daytime empty testing (as there was in August), during the 5-day closure 28 October-1 November

 

[Momodou2003]

there will be more daytime empty testing (as there was in August), during the 5-day closure 28 October-1 November

I meant during passenger hours when the Piccadilly line service normally runs?

 

[Backroom_boy]

How much running is:
* Type testing?
* Individual set running in?
* Staff familiarisation?

I guess there is a fair bit of overlap between all three?

 

[GFE]

I meant during passenger hours when the Piccadilly line service normally runs?

That is what has now been seemingly approved/agreed but currently only late evenings and limited area that has reached adequate trackside systems proving status (Northfields - Hammersmith)

 

[Snow1964]

Next weekend will mark the 2 year anniversary of first train arriving in London.

Time flies, and although testing and modifications have been ongoing, passengers have yet to see any running between other trains on test

 

[thomalex]

Next weekend will mark the 2 year anniversary of first train arriving in London.

Time flies, and although testing and modifications have been ongoing, passengers have yet to see any running between other trains on test

Crumbs, it’s already been 2 years!

 

[100andthirty]

It's three years since it started running on the test track in Germany