A commuter rail train without any passengers derailed north of the Andover station Tuesday morning, a day after MBTA overseers advanced two options for hiking fares roughly 6.7 or 9.7 percent.

Mac Daniel, a spokesman for Keolis Commuter Services, the commuter rail operator, told the News Service the train was traveling northbound to set up for the morning service. The derailment occurred about 4 a.m., according to Daniel, who a conductor and an engineer were on board and no one was injured.

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The two derailed coaches – which did not tip over – clogged railroad commutes north of Boston as it tied up trains farther up the line. Keolis canceled some runs and used buses to transport riders between Haverhill and Andover.

Daniel said officials are looking at track infrastructure as the possible cause of the derailment and expects commuter rail service to be "full steam" for the afternoon commute. He said if any deficiencies are found in the track it would be fixed before trains with passengers ride over it.

"The track structure failed. We don't really know why at this point," Rich Murphy, director of train operations for Keolis, said in a video posted online Tuesday morning explaining the delays.

Including the derailed train, five trains were trapped north of Andover as a result of the accident, according to Keolis.

MBTA spokesman Joe Pesaturo said the incident is under investigation.