A year later another ten units with a box design and a driving position at each end arrived.

These 'camel-back' bogie locomotives featured a central cab,[1] weighed 50 tons, were 35 feet 9 inches (10.90 m) long over the buffers and had four 215 hp (160 kW) traction motors.

[2] The second ten, also constructed by Metropolitan Amalgamated, were built to a box car design with British Thompson Houston control equipment.

In the early 1920s, the Metropolitan placed an order with Metropolitan-Vickers of Barrow-in-Furness for rebuilding the twenty electric locomotives.

Nineteen of the names chosen were of people, real or fictitious, who had a connection with the area served by the Metropolitan; the exception was no.

12 Sarah Siddons, has been used for heritage events, most recently in January 2019 running in conjunction with Metropolitan Railway Locomotive No.