These two lines are very different.

Ten stations are shared between the lines, of which only one; Queen's Park offers level boarding.

The Shared Stations

The nine shared stations often have considerable steps up and down, as at Willesden Junction station, which is shown in Train-Platform Interface On Platform 1 At Willesden Junction.

I am rather pleased and pleasantly surprised, that there are not more accidents at the shared stations, but using the line must be a nightmare for wheelchair users, buggy pushes and large case draggers.

If Transport for London proposed building a line like this, they would have to launch it at the Apollo, where comedians perform.

The One Train Type Solution

To my mind, there is only one solution. The two services must use the same type of trains.

These are a few thoughts on the trains.

Trains Would Be Underground-Sized

As the trains will have to work through the existing tunnels to Elephant & Castle station, the trains would have to be compatible with the tunnels and therefore sized for the Underground.

I suspect they would be a version of the New Tube for London, that are currently being built by Siemens for the Piccadilly Line.

New Tube For London And Class 710 Train Compared

These figures are from Wikipedia.

  • Cars - NTFL - 9 - 710 - 4
  • Car Length - NTFL -  12.6 metres - 710 - 20 metres
  • Seated Passengers - NTFL - 268 - 710 - 189
  • Total Passengers - NTFL - 1076 - 710 - 678
  • Passenger Density - NTFL - 9.5 per metre - 710 - 8.2 per metre
  • Speed - NTFL - 62 mph - 710 - 75 mph

Note.

The passenger density and speed are closer than I thought they'd be.

I'm sure Siemens can design a longer and faster train if required for the Euston service.

I feel that the New Tube for London could be designed, so that it could work the Watford DC service.

Platform Modifications

I suspect that the New Tube for London will be lower than the Class 710 train and all platforms would need to be lowered to fit the new trains.

I would also suspect that it would be easier to lower platforms, than modify them, so that they had dual-height sections to satisfy two classes of train.

It should be noted that the New Tube for London has shorter cars than the sixteen metre 1972 Stock trains currently used on the line, so there will be smaller gaps at stations with curved platforms like Waterloo.

I believe that with one class of train, all of the stations on the Bakerloo and Watford DC Lines could be made step-free between train and platform.

Queen's Park And Euston

This map from cartometro.com, shows the route between Queen's Park and Euston stations.

Note.

  1. The Watford DC Line is shown in orange.
  2. Queen's Park station is to the West of Kilburn High Road station.
  3. It appears that Watford DC Line trains always use Platform 9 at Euston station.

The route seems to be a self-contained third-rail electrified line into Euston station.

On the subject of electrification between Queen's Park and Euston stations, there would appear to be a choice between the third-rail system and London Underground's four-rail system.

But it is rumoured that the New Tube for London will have a battery capability.

As Euston and Queen's Park stations are only 3.7 miles apart, perhaps the choice would be to use battery power into Euston station, which would remove electrified rails from Euston?

How Many Trains Could Run Into Euston?

Currently, four trains per hour run into Euston.

It is generally accepted that six tph can use a single platform. But would this be enough?

I suppose there is the possibility of tunnelling under Euston station to a pair of terminal platforms.

In that case the current platform could be used by other services.

Southern's Milton Keynes And Clapham Junction Service

This service wouldn't be affected as it uses the fast lines between Willesden and Watford.

Conclusion

A common fleet used by the Bakerloo and Watford DC Line would appear to give advantages.