The Gloucester Railway Carriage and Wagon Company Limited also built number 17, the Great Western Railways - and the World's - first diesel parcels car to relieve passenger expresses of some of their heavy parcels traffic in the London area and also allow them to accelerate. Number 17's daily diagram started alongside Lyon's <PERSON> at what is now Kensington Olympia, where it was loaded with the firm's deliveries to the Reading and Oxford areas. On returning from Oxford number 17 picked up general traffic at all stations to <PERSON>, then completed its day with a similar working to Reading and back.