On the 10-40am Ordinary Passenger service to Liverpool Street
Peter Kerslake says "Although relegated to an "all stations" stopping service iit was on the tightly timed "Cambridge Buffet Express" that Gresley's class B17 were most remembered, putting in some memorable performances running via Hitchin on the East Coast main line.
61615 Culford Hall was one of the ten class B2 rebuilds from their original B17 classification and remained in service in its rebuilt form until February 1959. The original B17 design had, by virtue of the third and inside cylinder, proved heavier than had been intended and perhaps it was in an effort to reduce the axle weights that Edward Thompson rebuilt ten of thems in an effort to increase their route availability?"