Rail bosses have warned of travel disruption as conductors go on strike tomorrow.

There will be no Southern service from Clapham Junction to Milton Keynes as hundreds of Southern conductors walk out.

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

Two further strikes are planned next month.

Southern, which is 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."

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