David Cantrell wrote:
I saw this (well, I think it was this) running through Peckham Rye this
morning:
http://www.realtimetrains.co.uk/trai...11/06/advanced

It consisted of a diesel locomotive, a bunch of freight wagons, some
fancy modern passenger stock, then more freight wagons. What on earth
was it, and why the bizarre mixture?


That's a pretty normal way of delivering new trains. The freight wagons are
for coupling the passenger train to the loco(s) and also to provide
braking.