The New Democrat MPP for London-Fanshawe is calling the latest contract offer from a London locomotive plant a slap in the face to its employees.

Electro-Motive Canada locked out 420 workers on New Year's Day after making a take-it-or-leave-it offer that the union says included a 55 per cent wage cut and other concessions.

Teresa Armstrong says there's "no fairness whatsoever" to the company's offer.

Meantime, Premier Dalton McGuinty is offering his help to resolve the nasty labour dispute.

The federal Conservatives aren't commenting on the lockout at the plant, which Prime Minister Stephen Harper once used as a backdrop to tout business tax breaks.