Our group actually has one located in the yard at Newbridge on the NYMR
What history we know:-
Freightliner Caboose 99Z03
http://yorkareagroup.co.uk/wp-conten...boose-nymr.jpg
One of 5 built at Derby in 1965. BR Lot No 3572, Diagram 3/490.
Empty freightliner boxes began trial running in 1965 but a dispute arose between BR, ASLEF and the NUR over the guard riding in the rear cab of the loco. The caboose was brought in as a way to provide accomodation for the guard. Previous trials had involved running a brake van behind the loco and use of a converted 10 ft container. The trials were not a success due to the ride quality of the vehicle. Some guards suffered injuries arising from being thrown around the vehicle especially when travelling over pointwork.
Agreement subsequently reached with the other union for the guard to ride in the rear cab as originally proposed.
This example survived as a crane drivers bothy at Stourton Freightliner depot Leeds. Purchased by a PW Volunteer.
2 other examples known 1 at The NRM York (wrongly numbered 09Z04) and another example was in existance at Southampton but not known if still survives.
A photo does exist of one being in service on the back of a train, however our understanding is that they only ever made one trip so that photo will be a rare one.
The survivors stayed because they were used as yard bothys.