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[email protected] · October 27th 12, 02:16 PM posted to uk.transport.london

In article , (Roland Perry)
wrote:

In message , at
06:35:10 on Fri, 26 Oct 2012, remarked:
The trouble is the power supply North of Milton as you should well
know. Otherwise there could be regular 8- and 12-car trains North of
Cambridge.

That could be solved by running more 4-car trains, but wasn't the
point I was making, which is that Cambridge station isn't just used
by people travelling to Kings Cross, there are other busy
destinations too.

It couldn't actually. The power supply limit is on the total number of
units north of Milton, coupled together or not.

But there's currently only 1ph electric north of Cambridge. Must be
some margin for extra services.

And then there are the capacity constraints imposed by the amount
of singling to electrify to Lynn on the cheap.

Last night about three quarters of the people got out at Ely, so we
should be looking to turn more units there (rather than perhaps
Chesterton Sidings).

I didn't reply earlier because I was leading a visit to Cambridge Power
Signal Box this morning. While I was there I checked on the limit North of
Milton. It is six units (or, more precisely, pantographs).

One train each way per off peak hour is two units but there are more in the
peaks. The present timetable only provides four units on the line at the
most but it only requires a little out of course running to push that up to
five if not six.

There are up to five units on the line during the Monday-Friday evening peak
while the 8-car 19:09 Cambridge to Lynn runs. There will also be empty stock
movements as the Lynn and Ely peak services don't have balancing passenger
workings.

--
Colin Rosenstiel