Rail bosses have warned passengers may not be able to get to their destinations tomorrow.

Hundreds of Southern conductors will go on strike tomorrow but rail services will be disrupted from first thing in the morning.

The Brighton mainline service will start as usual tomorrow morning but the Coastway service which runs through Lewes and Hove will not start until 7.30am.

Services will finish at 6.30pm.

No trains at all will be running on the Seaford branch.

Nor will services will be running east of Eastbourne towards Ashford or west of Chichester towards Havant.

Services on the metro routes should continue to run as usual because 40% of services are already run by driver only trains.

"Unfortunately we cannot guarantee to get you to your destination," Southern said in a message to passengers.

Two further strikes are planned next month.

The Argus: Red lines on the map indicate no service; yellow indicates significantly reduced service between 07.30 and 18.00; Blue indicates reduced service, trains expected to be very busy. Download the full map: Southern_services_during_RMT_strike.pdf

Southern owned by Govia Thameslink Railway, plans changes to the role of conductors which will see responsibility for operating the doors switched to the driver.

The union fears the changes will represent a "lethal gamble" with passengers lives.

Transport Secretary Patrick McLoughlin said: "I condemn any industrial action that will disrupt the travelling public. I expect to see operators and the unions working together to resolve these issues.

"Rail passengers will not thank the unions for inflicting this unnecessary disruption. It is clear that the changes GTR are proposing will modernise services and provide better journeys for passengers."

Mick Cash, RMT general secretary, said: "This dispute is about safety and the safety-critical role of the guards on Southern trains.

"The company, with an eye on ever-fatter profits, is prepared to axe the guards on some of the most overcrowded and potentially dangerous services in Britain so that they can squeeze every last penny out of their passengers regardless of the consequences.

"That is a lethal gamble with safety in the name of profit and that is why we have been forced to take strike action.

"Southern see their passengers as nothing more than self-loading freight, there to be fleeced at every turn and every opportunity.

"The consequences of removing guards, the human eyes and ears on that dangerous interface between crowded platforms and crowded trains, is blindingly obvious to anyone but the rip-off merchants running this deeply unpopular rail franchise.

"The company have now resorted to trying to bully and intimidate staff taking a stand to defend the safety-critical role of the guard. That is disgusting but nothing surprises us with this mob.

"The union stands firm and united in advance of tomorrow's action and we urge the public once again to support their rail workers."