BROOKLYN - Glitches in the operating system have put the ?L? robotrains on hold.

The trains were suspended after a train on a Brooklyn platform took off on its own, traveling 3 to 5 feet before a crew member on board hit the emergency brakes.

The trains have been operated by a communications-based train control system for more than a year. The computerized system lets operators control the train from remote locations.

Only robotrains have been suspended. Conductor-operated ?L? trains are still running.