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The North Pole Express holiday train trips will use diesel locomotives instead of the historic Pere Marquette 1225 steam engine.

An unforeseen mechanical issue with the steam locomotive was discovered during a test run.

The Steam Railroading Institute is working to diagnose the problem and return the 1225 to service as soon as possible.

The popular holiday excursion, inspired by "The Polar Express," was sold out for its trips between Owosso and Ashley, Michigan.

OWOSSO — Those with tickets for the sold-out North Pole Express may not get the old-fashioned holiday train trip they were looking forward to.

“An unforeseen mechanical issue" was discovered during a test run of the steam locomotive Pere Marquette 1225 before the first official North Pole Express trip be

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