the route. As it is a low priority to be electrified, the only realistic alternative option to replace diesel powered rolling stock is with battery powered. The test will see the existing Class 165 units replaced by battery-electric multiple unit trains produced by Vivarail, with the company's Fast Charge equipment installed in the bay platform at West Ealing. This will entail the installation of a conductor rail that becomes live only when a train is above it. This is then used to charge the lithium-ion batteries on the train, a process that would take about ten minutes. Current service The passenger service is provided by Great Western Railway. Trains from the branch terminate at West Ealing, except for one service from Paddington at the start of the day, and to Paddington at the end of the day. There was a parliamentary service operated by Chiltern Railways from 10 December 2018 that, on weekdays, started from South Ruislip and ran non-stop along the line to West Ealing, before returning to West Ruislip. It previously operated to High Wycombe, but was later curtailed. It then became unidirectional from West Ealing to West Ruislip, running once a week on Wednesday mornings. All services are operated with two-car Class 165 Turbo diesel trains. There is no Sunday service. Passenger volume These are statistics of passenger usage on the National Rail network along the Greenford branch line from the year beginning April 2002 to the year beginning April 2019. Connections At Greenford: London Underground Central line. At : Elizabeth Line to Paddington, Heathrow Airport, and . References Further reading Railway lines in London Railway lines constructed by the Great Western Railway Railway lines opened in 1903 Railway branch lines Standard gauge railways in London Transport in the London Borough of Ealing