A fresh three-day strike by staff on Southern rail is under way, with hundreds of trains cancelled.
The action is over plans for drivers, rather than conductors, to operate carriage doors at certain times.
It is due to last until Friday morning, with a further three blocks of strikes planned before Christmas.
The train drivers’ union Aslef is to ballot members over industrial action after talks with Southern failed to resolve a row over driver-only trains.
Aslef is resisting their introduction, or extension of new driver-only operated routes, on Southern’s network without its agreement.
Mick Whelan, general secretary of Aslef, said: “We have genuinely sought to reach a compromise with Southern. The company has not been prepared to negotiate.
“They want to impose, not to discuss. They have dug in their heels and forced us to ballot our members.”
Ballot papers will go out on members on 4 November and result is due to be announced two weeks later.
Read more: http://www.bbc.com/news/uk-england-37679532