A Metro-North train heading out of Grand Central Terminal side-swiped a switcher engine heading the opposite direction earlier this afternoon, causing delays that lasted around two hours.

According to Metro-North spokesperson Aaron Donovan, the collision happened just after the 11:20 a.m. train bound for Croton Harmon departed the station. No injuries were reported, and passengers were able to walk back to Grand Central by passing through the train cars. The cause of the incident is under investigation, though there's no indication that either locomotive was traveling more than 10 mph.

The scene at grand central station after the train I was on collided with something and had to return to loading dock pic.twitter.com/WjF3nxlq3V — Mitchell Abramson (@nydnmabramson) December 17, 2014

A commuter at Grand Central during the response was told by one passenger that there was a "ton of metal on metal crunching, then we were stuck in the tunnel."

Delays of up to 20 minutes persisted on the Harlem, New Haven and Hudson lines, with the Hudson line the last to return to normal just after 1 p.m.

The cause of the incident is under investigation.