Southeastern is aiming to run its regular timetable today, Monday 21 January, but early morning trains are being cancelled and services disrupted on some routes.
Where possible it is operating longer trains with more carriages.
Freezing temperatures over the past few days and long periods of heavy snow across much of south east London, Kent and East Sussex are having a detrimental impact on the railway service in the region.
Southeastern is advising passengers to check how their train services are running before leaving home and, if travelling, allow additional time for their journey.
More top news
Philippa has the latest weather for the east
Philippa has the latest weather for the west
Arctic temperatures are forecast this week, with the Met Office warning of blizzard conditions in the south on Thursday