Initially the Metropolitan Railway relied on locomotive power supplied by the Great Western Railway. But in 1864 the railway acquired 18 4-4-0 tank engines built by Beyer Peacock in Manchester. A further 48 were Initially the Metropolitan Railway relied on locomotive power supplied by the Great Western Railway. But in 1864 the railway acquired 18 4-4-0 tank engines built by Beyer Peacock in Manchester. A further 48 were built between 1866 and 1885. between 1866 and 1885.

The first Metropolitan Railway steam locomotives were ordered in 1864 for the Metropolitan Railway, to replace the Great Western Railway locomotive that had opened their first line the previous year. A total of 116 locomotives were built, of which two survive in preservation.

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