On Jan 1, 6:17*pm, Peter Lawrence wrote:
On 01/01/2011 13:56, Clive Page wrote:

In message
,
D7666 writes
Both A and B at SPILL are used at weekends, although things do not
seem fixed from one weekend to the next, it depends on what actual
work is taking place.

Thankyou. My surprise was not at the bi-directional working but that one
train could catch up with another when both (presumably) used the same
southbound platform at Kentish Town and the second one must wait for the
crossover points to be changed after the first one. *Does the
bi-directional working extend as far north as Dock Junction and Kentish
Town?

Trains can run off of the up slow (as normal) into St Pancras and they
can also run off of the up fast, through P3 and then in the up
direction along the Down Slow which is what I suspect you saw. Coming
out both trains would need to run along the down slow for a short
period of time, the one using the up slow in the down direction would
have to wait for the train running down the down slow to clear into
platform 2 or 3 at Kentish Town first before crossing over onto the
down line. It is also possible that the overlap on the track circuits
could prevent the signal clearing until a train has cleared the
station or a time out has taken place. Not sure in this case.

Richard

On 01/01/2011 19:32, Fat richard wrote:
On Jan 1, 6:17 pm, Peter wrote:
On 01/01/2011 13:56, Clive Page wrote:

In message
,
writes
Both A and B at SPILL are used at weekends, although things do not
seem fixed from one weekend to the next, it depends on what actual
work is taking place.

Thankyou. My surprise was not at the bi-directional working but that one
train could catch up with another when both (presumably) used the same
southbound platform at Kentish Town and the second one must wait for the
crossover points to be changed after the first one. Does the
bi-directional working extend as far north as Dock Junction and Kentish
Town?

Trains can run off of the up slow (as normal) into St Pancras and they
can also run off of the up fast, through P3 and then in the up
direction along the Down Slow which is what I suspect you saw.

Thankyou, that explains it.

Coming
out both trains would need to run along the down slow for a short
period of time, the one using the up slow in the down direction would
have to wait for the train running down the down slow to clear into
platform 2 or 3 at Kentish Town first before crossing over onto the
down line. It is also possible that the overlap on the track circuits
could prevent the signal clearing until a train has cleared the
station or a time out has taken place. Not sure in this case.

Richard