On 2015\11\24 16:00, Eric wrote:
On 2015-11-24, Basil Jet wrote:

I didn't make myself clear. I meant that I see no reason why the trains
terminating at Liverpool Street have to be as long as the trains going
through to Paddington. Certainly not if they have to lose a platform to
do it. How long are these trains and platforms now? Why would the
introduction of Crossrail bring about an increase in the number of
people using Liverpool Street, because I would expect a decrease.

Because over time the cost of not having a uniform fleet (spare sets,
scheduling problems for the normal timetable, flexibility when something
goes wrong ...) is probably greater than the cost of fiddling with
the end of one platform (2 faces). That's all its about. There _will_
be fewer passengers (and fewer trains) at Liverpool Street ("surface"),
so there's no reason not to lose one platform that is just long enough
for an 8-car 315.

I suppose when you add up all the costs involved it does make sense!