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© Transport for London
Collection of London Transport Museum

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Metropolitan Railway A class 4-4-0T steam locomotive, number 23, 1866

This steam locomotive was built by Beyer Peacock in Manchester in 1866. It is one of the original Class 'A' 4-4-0 locomotives purchased for the Metropolitan Railway Inner Circle services. They had condensing tank engines, designed to limit smoke emission in the tunnels. However, the atmospheric pollution was still terrible. The Circle line was electrified in 1905 and steam locomotives came out of service on the Underground.
From 1935 to 1948, Number 23 was used for track maintenance duties. During this time it was Britain's oldest working steam locomotive.

Entered service: 1866

Withdrawn: 1905

Manufacturer: , Beyer Peacock, 1866

Reference no: 1981/535