File:Oerlikon electric train at Harrow and Wealdstone.jpg

Summary
'Oerlikon' electric train at Harrow and Wealdstone, Middlesex. These heavy electric trains, which were in use at this time on the services from Watford Junction to Euston and Broad Street, and also from Broad Street to Richmond, had electrical equipment by the Swiss firm of Oerlikon. They were both reliable and fast, but they caused considerable wear to the tracks, which were shared with London Transport's 'Bakerloo' tube trains. The Oerlikon trains were replaced during 1957-58 with more modern (but much less interesting) stock. These services still continue, nowadays using Class 313 and Class 508 trains.