The British Rail Class 21 was a type of diesel Hydraulic locomotive built by the North British Locomotive Company in Glasgow for British Railways in 1958-1960. They were numbered D6100-D6157. Thirty-eight of the locomotives were withdrawn by August 1968; the rest were rebuilt with bigger engines to become Class 29, although those locos only lasted until 1971.

The Dapol OO Gauge model of the Class 21/29 features:

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