Passengers are being advised about major changes to train services between Clapham Junction, Willesden and Watford Junction from Saturday 25 October.
Network Rail is carrying out urgent work to renew a level crossing during a four-day closure over the October half-term school holidays.
The work is needed to keep the railway safe and reliable for passengers and freight services, and to remove a speed restriction on the line.
The essential improvements will secure the future of the infrastructure and allow continued access for vehicles to a busy industrial estate at Willesden.
Author's summary: Train services to change due to level crossing work.