NEWARK, N.J. (AP) - Amtrak passengers are facing delays of up to an hour between Boston and Washington after two cars of a commuter train derailed near New York City's Penn Station Tuesday.

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Only one track is available in each direction.

Keystone service will temporarily operate between Philadelphia and Harrisburg, Pa., only.

New Jersey Transit spokeswoman Courtney Carroll says no one was injured when the last two cars of a 10-car commuter train jumped the tracks around 8 a.m.

Carroll says Train 3823 was heading toward Trenton when the derailment occurred.

Carroll says the 300 passengers aboard were transferred to another train by 9:18 a.m.

Northeast Corridor and North Jersey Coast Line trains are facing delays of up to 60 minutes. Midtown Direct trains are operating to and from Hoboken Terminal.