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→TOPS locomotive classification and numbering: Add Lady A (!) and fix links
BR steam had finished before the introduction of TOPS. BR Diesel locomotives were allocated numbers forming the unique ID in the form xxyyy, with xx being the class and yyy one of up to 999 members of it, for example [[50031 |50031 Hood]] would have been the 31st Class 50 locomotive while in service.
'''Heritage diesel locomotives''' working on the main line are allocated numbers in the 89yyy series. Generally the third digit represents the power classification and the final two digits are the last two digits of the pre-TOPS number, except where duplication occurs. TOPS numbers allocated to SVR locomotives include:<ref>[https://www.rcts.org.uk/aboutlocomotives/newstops-class-89/89xxx.htm RCTS TOPS Class 89 listing]</ref>
*89413: [[BR Class 52 D1013 Western Ranger|D1013 Western Ranger]]
*89416: [[BR Class 52 D1015 Western Champion|D1015 Western Champion]]
*89462: [[BR Class 52 D1062 Western Courier|D1062 Western Courier]]
[[File:45110_Cab_20180804.jpg|thumb|300px|right|45110 cab interior showing the TOPS number used in preservation]]'''Heritage steam locomotives''' working on the main line are allocated numbers in the 98yyy series. Generally the third digit represents the power classification and the final two digits are the last two digits of the BR era number, except where duplication occurs. TOPS numbers allocated to SVR locos still resident on the SVR include:<ref>[https://www.rcts.org.uk/aboutlocomotives/newstops-class-98/98xxx.htm RCTS TOPS class 98 listing]</ref>*98186: [[686 The Lady Armaghdale]]
*98243: [[46443]]
*98406: [[43106]]
