A slow trip by a massive steam locomotive dubbed "Big Boy" to its new home has been delayed by a high volume of traffic along the rail lines it's using.
Officials say the original plan called for the former Union Pacific Railroad locomotive to begin its trip Sunday at Fair Park in Dallas and conclude the same day about 30 miles north in Frisco.
But Frisco city spokeswoman Denise Stokes said Monday priority is given to several rail lines that move freight along four separate tracks in the region. This could delay Big Boy's arrival by several days.
The historic engine, weighing 1.2 million pounds, is being pulled by another locomotive toward the site of the relocated Museum of the American Railroad. It creeps along at about 10 mph.