7900 MR Square base, long
7901 MR Kirtley Square base, short
7904 Pre-Group Round Base Parallel
7905 London and North Western
7906 GWR Collett Parallel
7907 GWR Early Collett Taper
7908 GWR Dean/Churchward/Armstrong Taper
7909 LNER/SR Stepped Parallel
7910 Drummond Standard LSWR/HR/CR/GSWR
7911 LNWR Cooke Type