In article , Clive D. W. Feather
writes
In article , Roland
Perry writes
Currently the ECML is a high speed line with the KX-Hitchin part
taking approx 21 minutes (that's in an IC225, I'm not sure the WAGNs
could keep up with that, it's an average of 90mph).

This leaves 25 miles on the Cambridge branch. To meet a 45 minute
schedule that requires an average speed of just over 60mph, which is
what they just about manage to achieve on today's track.

The bit of the working timetable for Cruisers that I've been able to
find gives:

KX depart XX15
Finsbury Park pass XX18.5
Alexandra Palace pass XX20 0.5 pathing allowance
Potters Bar pass XX25.5
WGC pass XX30
Woolmer Green pass XX32
Stevenage pass XX34
Hitchin pass XX37

22 minutes. I had allowed 21. Nice to be so close to the actual answer
using only classic engineering estimating skills!

Letchworth pass XX40
Royston pass XX47 2 engineering allowance

(And it means one minute less for Hitchin to Cambridge, 25 miles to do
in 13 minutes for a 35 minute journey - 115 mph average. Not very
realistic...)
--
"now, the thing you type on and the window you stare out of are the same thing"