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Today, Amtrak began operating some Acela Express trains for the first time since officials discovered cracks in many of the trains’ disc brake rotors about three months ago.

Operating Monday through Friday, the trains will depart twice in the morning and afternoon from New York and Washington, D.C., and serve all regular Acela destinations. During the next several months, Amtrak will gradually reinstate other Acela trains to replace the Metroliner trains the railroad currently operates.

Since the disc brake rotor defects were discovered in April, a Bombardier Transportation/ALSTOM consortium — which manufactured the trains — has developed and tested a new disc design. The new discs will continue to be inspected as part of regular maintenance cycles.