Metro-North trains were back to normal service shortly after 9 a.m. after a troubled train on the Harlem line became disabled twice on its run, causing minor delays on the Harlem and New Haven lines, officials said Thursday.

The 5:59 a.m. train out of Wassaic, due at Grand Central Terminal at 8:03 a.m., first became disabled at the Mount Vernon West station about 7:50 a.m. due to electrical issues, Metropolitan Transportation Authority spokesman Aaron Donovan said.

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The "dual-mode" train was able to switch to diesel power but experienced locomotive problems at the Melrose station in the Bronx and became disabled again at 8:05 a.m., causing five- to 10-minute delays on the Harlem and New Haven lines, according to Donovan.

A repair crew was eventually able to get the train up and running again and it stopped, 42 minutes late, at Harlem/125th Street, where the train was taken out of service and passengers were told to change to other trains to take the final leg to Grand Central Station.

Normal service resumed on all Metro-North lines as of 9:03 a.m., Donovan said.