In message , at 19:47:17 on Sat, 19
Dec 2015, Tim Ward remarked:

So it's like this:

Ely ------------------------------------ Peterborough
\
Ely ---------a-------------------------- Peterborough
\
*
\
b------c--------------- Kings Lynn
\ \
\ -------------- Kings Lynn
\
d------------------ Norwich
\
----------------- Norwich

As is fairly obvious, places like "*" are a monster bottleneck.

That looks a bit cheap and nasty, even to a non-trainspotter. Whose
clever idea was that design then?

British Rail (the nationalised outfit which people still insist could
have done no wrong) in the 70's/80's simplifying lots of junctions to
have fewer moving parts, on the grounds that rail transport was in
managed decline.

At the time there was probably only 1tph in either the Kings Lynn or
Norwich directions.
--
Roland Perry