NEW YORK (CBSNewYork) — Crews were racing against the clock on Sunday to make repairs before the start of the work week after a part of a Long Island Rail Road train moving through the West Side Yard derailed.

The Metropolitan Transportation Authority tells CBS2 the train, which wasn’t in passenger service, was moving through the yard Saturday evening when two of the middle cars derailed. No customers were on board at the time of the derailment, but the MTA says one employee on board reported back pain after the incident.

LIRR was unaffected Sunday as crews worked to repair damage to the tracks which allow train movement to and from the yard, according to the MTA. The agency did announced several cancellations ahead of the Monday morning rush.

Meanwhile, seven lines were already scheduled to have changes on Monday as new summer timetables take effect. For more on the scheduled changes, CLICK HERE.

The cause of the Saturday derailment remained under investigation.