Reference taken from - https://www.rrhobby.ca/metvicbobo.htm

In 1907 ten locomotives numbered 11-20, also of the Bo-Bo type, (the locomotive pictured below) more exclusively for the Metropolitan's own use were added. Built by British Thompson Houston to a box cab design which gave it the appearance of a luggage van. The body work was of all steel. BTH electrical equipment,  dual brakes, vacuum for the train and air for the locomotives was used. The specifications called for a 120 ton train to be pulled at 35mph on the level and to start on a 250 ton train on 1 in 35 and haul it up 1 in 44.

In 1902, the Metropolitan Railway started to electrify its routes. To this end, in 1904, ten locomotives were ordered from the Metropolitan Carriage & Wagon Co. Built between 1904 and 1906 these bogie locomotives featured a central cab, (there was a preserved one in York railway museum) somewhat like the previous Central London locos, although larger.

They weighed 50 tons, and had four 200hp traction motors. The electrical equipment was to a Westinghouse design similar to those used on existing multiple unit stock. The first were delivered in 1905, and were numbered 1-10. They were of the Bo-Bo type, on two four wheel bogies, and were intended for hauling Great Western main line trains between Bishop's Road (Paddington) and Aldgate.

These locomotives worked the outer suburban routes, hauling conventional carriage stock. Other routes were worked by 1902 and 1904 built electrical multiple units. The locomotives lasted in service until 1922/23, when they were replaced by new locomotives constructed by Metropolitan Vickers.