I wrote a table, which showed the actual booked speed from Royston to
Cambridge as averaging 56mph. I then said:

The 2 minutes difference between D and E out of King's Cross is to
allow for the train to accelerate, so we should expect the same at
Cambridge. That leaves 4 minutes lost between Royston and Cambridge in
13 miles.

Sorry, that should be 2.5 minutes (compared with a 100mph journey
throughout). The other 1.5 is allowance for engineering work.

So the current actual booked speed is 74mph north of Royston, not
including deceleration allowance.

Overall, the timetabled 46 minutes consists of:
- 2 minutes accelerating
- 2 minutes decelerating
- 3 minutes for pathing and engineering work
- 39 minutes at speed (compared with 34 at 100mph).

Making an average "full" speed of 87.5mph.

--
Clive D.W. Feather | Home:
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