RAIL unions slammed David Cameron’s election promise to freeze train fares yesterday as a “con” and called for an end to the rail privatisation rip-off.

The Prime Minister said extending the RPI inflation cap on regulated ticket prices for another five years would save the average commuter hundreds of pounds.

But train drivers union Aslef general secretary Mick Whelan said: “The devil, with David Cameron, is always in the detail” and pointed out fares will still rise with inflation.