Union bosses have warned of a "summer of discontent" if the Government presses on with its threat to tighten industrial action laws to make it harder to hold a rail strike.
Transport Secretary Grant Shapps said that ministers are looking at drawing up laws which would make industrial action illegal unless a certain number of staff are working.
He said that the Government hopes the unions "will wake up and smell the coffee" and suggested that strikes could put more people off rail travel.