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The British Rail Class 951 was reserved for former diesel-electric multiple units converted for departmental use. Units were converted for various tasks, including application of sandite, de-icing duties, and use as tractor units to tow other trains. This classification is now obsolete, as all units have either been withdrawn, or renumbered into the Class 930 range.

v t e British Rail Departmental Multiple Units
Diesel Multiple Units	Class 901 (From Class 101) · Class 930 · Class 950 (Similar to Class 150) · Class 951 (From Classes 201, 203, 205, 207) · Class 960 (From Class 101, 107, 114, 117, 121, 122, DL)
Electric Multiple Units	Class 910 (From Class 488) · Class 920 · Class 930 · Class 931 · Class 932 · Class 933 · Class 935 · Class 936 (From Classes 311, 501) · Class 937 (From Classes 302, 308) · Class 960 (From Classes 309, 310) ·
Others	APT-E · Multi-Purpose Vehicle · New Measurement Train · Parry People Movers 999 900
Diesel locomotives · Electric locomotives · Miscellaneous locomotives · Diesel multiple units · Electric multiple units · Departmental multiple units

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