Southern Rail conductors are striking again over a dispute about the role of guards on their trains.
Members of the Rail, Maritime and Transport union (RMT) walked out just after midnight over a new on-board supervisor role and plans for drivers to operate doors, the BBC reported.
RMT general secretary Mick Cash said: "Our members have been backed into a corner by this aggressive and unpopular company and have had no option whatsoever but to fight to defend the safety-critical role of the guard on these rammed-out and unreliable Southern routes.
Their actions were described as "unnecessary" by operator Govia Thameslink.
Queueing systems were in place in many stations and that passengers were warned to check Southern's website before travelling.
But despite some suggesting that major disruption could occur, some commuters suggested that things were actually better than usual...
Some suggested alternative modes of transport for those who did wish to avoid using Southern Rail...
The 'BadSouthernRail' Twitter account also shared some other 'reasons' as to why conductors may have made the decision to walk out...
Southern said that the Gatwick Express and Thameslink services would be largely unaffected.
However some Gatwick Express services would be unable to call at certain stations.