South West Trains are warning about cancellations and delays for services between Twickenham and Clapham Junction, between Feltham and Clapham Junction and between Twickenham and Hounslow due to over running engineering works between Barnes and Clapham Junction.
Waterloo to Reading services will run to Clapham Junction and be diverted via Kingston to Twickenham, with other services subject to diversions and alteration.
Tickets are being accepted on First Great Western, London buses, Underground and Overground.
Services on parts of our network are being disrupted this morning as a result of adverse weather conditions which have also affected other train operators.
Cold weather conditions have caused a build-up of ice on the conductor rail which is used to power our trains.
When ice forms on the conductor rail it affects the power supply to trains and services are prevented from running normally.
As a result there are delays to services across some parts of our network. Services between Havant and Guildford are currently subject to delays of up to 60 minutes.
Trains between Waterloo and Reading are currently delayed by up to 30 minutes. Trains operating between Ascot and Guildford may be delayed by up to 40 minutes while services between Farnham and Alton are suspended.
We would like to apologise to customers for the delays to their journeys this morning.