Speaking on BBC Radio 4's Today programme, Corbyn said he supported the strike over driver-only trains and would join the picket line.
Asked if he would join striking drivers and guards on picket lines, the Labour leader told BBC Radio 4's Today programme: "Yes I would, because I think Southern rail have behaved in a awful manner and the government seems to be more interested in protecting Southern rail despite its appalling service and shortage of trains, overcrowding, and continues allowing them to run the franchise".
SOUTHERN drivers are on strike again today in the latest series of walkouts in the DOO dispute, and nearly no trains are running.
Meanwhile, it is back to business for London Underground.
And he accused the Government of being "more interested in protecting Southern Rail despite its appalling service".
For those who must travel, the train operator is providing limited bus and coach every day to provide road links for essential travel from nine of its stations into nearby neighbouring rail networks. On a normal weekday Southern has 2,242 trains timetabled.
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Jessica Hope said: "There was a certain added injustice at actually having to pay to get on the (train) at #EastCroydon for such a poor service today #southernstrike".
"We wish to remind our passengers not to attempt to travel unless it is absolutely necessary on this week's strike days".
"We are deeply sorry for the unnecessary and unwarranted disruption this dispute is causing".
Union members also plan to walk out on 24, 25 and 26 January in the long-running dispute.
Last week, the general secretary of ASLEF, Mick Whelan, said: 'We are taking a longer-term view of this trade dispute.we remain committed to a negotiated settlement. but it is hard to negotiate with people who are not prepared to be flexible. Angry commuters not only blame the two sides in the dispute but also the government which under the terms of the franchise deal has to pick up the compensation bill for passengers but has so far declined to intervene in the row.