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A number of different numbering and classification schemes were used for locomotives and multiple units operated by British Railways , and this page explains the principal systems. This section also covers the post-privatisation period, as the broad numbering and classification arrangements have not altered since the break-up of BR.

Locomotives and multiple units have frequently had similar arrangements for classification and numbering, so are considered together here. There are also links to other pages that deal in greater depth with the particulars of individual types.