Emergency engineering works are also causing disruption on all South West Trains through Wimbledon this morning.
Network Rail says passengers can expect delays of up to 50 minutes - and the following services have been altered until further notice:
- A train shuttle is running between Hampton Court and Surbiton. Customers travelling to London Waterloo will need to change trains at Surbiton.
- A train shuttle is running between Shepperton and Kingston. Customers travelling to London Waterloo will need to change trains at Kingston.
- Services to and from Exeter / Yeovil / Salisbury will terminate at Basingstoke. Passengers should connect with alternative services at Basingtoke.
- Services to and from Dorking are cancelled. Passengers travelling on this route can use Southern services between Dorking and Clapham Junction / London Victoria until further notice.
More top news
Paramedics were on standby outside the police cordon as armed officers stood by the property.
A team of researchers has taken samples from the ten busiest London Underground lines to work out which are the dirtiest.
The action comes on top of an emergency timetable which has seen hundreds of trains a day being axed.