a few exceptions. Some ex-LNER locomotives have numbers based on their LNER pre-1946 numbers, these being Class A3 Flying Scotsman (4472), Class A4s Mallard (4468) and Sir Nigel Gresley (4498), LNER Class J36 Maude (NBR 673, LNER pre-1946 9673) and Class V2 Green Arrow (4771). Furthermore, the aforementioned locomotives not of BR origin obviously cannot have numbers based on non-existent BR numbers, so Lady Armaghdale number is based on the works number 686, Barbara on the works number of its 1962 rebuild, and Tornado is assigned the number it carries, 60163, being one greater than the last of the previous Peppercorn A1s. In a few cases, this process results in the duplication of an existing number, so another is assigned. SR Class U 31625 is TOPS 98426 as it would otherwise duplicate GWR 7325 (TOPS 98425), BR Standard Class 8 71000 Duke of Gloucester (TOPS No. 98802) as it would otherwise duplicate GWR King Class 6000 King George V (TOPS No. 98800). List of locomotives assigned TOPS numbers The following is a list of locomotives assigned TOPS numbers. In the power class column, * denotes that this locomotive was not ex-BR and therefore was not assigned a power class by BR. In some cases the names indicated have only been applied during the preservation period. The given power classes are based on the ones used in the locomotive's TOPS number. BR changed the rating of a few classes e.g. LNER V2 were classified as 6MT, but this was later changed to 7P6F. An up-to-date list of active mainline locomotives is maintained here. References External links British Rail locomotives Vale of Rheidol Railway Steam locomotives of Great Britain Standard gauge locomotives of Great Britain Narrow gauge locomotives of the United Kingdom