"Jack Taylor" wrote in message
...
Mojo wrote:

Pardon my ignorance, but what signaling problems would affect the use
of SDO, such as not releasing the doors in the rear coach?

Sorry, I wasn't very clear on that, was I? Willesden Junction will only
hold three cars. With four car units it would not be possible to pull
forward such that the inner sets of doors in the leading and trailing
cars were at the platform and the other sets cut out because of the
position of the station starting signal at the end of the platform. Either
that would need to be relocated or otherwise both sets of doors on the
rear car would have to be cut out (as that would be off the platform) -
not very desirable or customer friendly.

Doesn't SDO require the guard and driver to be able to get out onto the
platform, so having the front car off the platform may not be an acceptable
solution even if the signal could be moved.

Paul