RMT and Unite members at Wabtec's plant in Hexthorpe, near Doncaster, struck from 10-13 June, after bosses used fire-and-rehire tactics to force workers onto worse conditions.
The new contracts, imposed under threat of dismissal, included cuts to break times and increases to hours with no additional pay.
The plant provides maintenance for various freight train companies' rolling stock, including DB Schenker and GB Railfreight. It's good the unions have named a further round out action, escalating to a week-long strike from 27 June to 3 July.