UPDATE 8/20: The Big Boy's big move is, once again, delayed.

Officials with the Museum of the American Railroad confirmed to News 8 Tuesday morning the move will again be delayed until at least Saturday due to complications.

EARLIER: DALLAS After months of delays, a mammoth steam locomotive is finally (but slowly) headed to its new retirement home in Collin County.

On Sunday, the 1.2-million pound "Big Boy" was pushed out of the siding at Dallas Fair Park where it has spent nearly the last five decades, starting a roundabout, 55-mile move to the Museum of the American Railroad in Frisco over track belonging to Burlington Northern Santa Fe; Dallas, Garland & Northeastern; Union Pacific; and Trinity Railway Express.

The huge engine, Union Pacific No. 4018, was built in 1942 to transport war materials on the rails.

On Sunday, longtime railroad men (and even wide-eyed little boys) came to see the Big Boy off on its next chapter.

"I'm really excited," said young Daniel Cate. "It's actually pretty impressive, and I see why they call it the Big Boy... because it's big!"

It's been slow going. The locomotive was scheduled to be in Frisco by late Sunday afternoon, but there were several delays along the way.

It was decided that Big Boy would spend Sunday night in Irving before resuming its journey.

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