The power was out for three hours Wednesday morning and was restored at about 11:30 a.m. Amtrak spokesman Cliff Cole warned that residual delays were likely, but a train leaving Union Station toward New York City before 1 p.m. was listed as on time.
The train station is busy, but the crowds don't look like more than the usual high volume in the run-up to Christmas.
An electrical problem in northern New Jersey forced the railroad to halt trains in and out of New York's Penn Station at about 8:45 a.m.
That left commuters and holiday travelers stuck or scrambling for alternatives as service slowed to a crawl or stopped in much of the Northeast.
There's no word what caused the problem.