Am I right in thinking that even though the D6xx Warships weren't around when TOPS was introduced in 1973(?), the plans for TOPS being worked out gave them the Class number 41?
I believe this happened for a number of classes, and eventually by the time TOPS was introduced some amalgamation had happened (i.e., class 34 became
33/1). I have a loco book (one of the Ian Allan ones) from 1969-70, which has the TOPS numbers in, but all the locos are still in pre-TOPS order (i.e., by Type and D number).Ian J.