A Toronto Transit Commission worker is in critical condition after he was caught between two vehicles at McCowan Yard in Scarborough early Sunday.

Dave Viljakainen, deputy commander of Toronto Paramedic Services, said paramedics were called to the TTC yard near McCowan and Ellesmere roads at 2:18 a.m. The yard is a storage facility for vehicles used on Line 3, the Scarborough RT.

Stuart Green, spokesperson for the TTC, said the man underwent surgery following the incident and is listed in critical condition.

The Ontario Ministry of Labour is on the scene, he said.

"We are co-operating with the investigation," Green said.