Taken from their web site:
Union Pacific Steam Schedule
Big Boy No. 4014 will depart Cheyenne, Wyoming, Thursday, Aug. 5, traveling through Arkansas, Colorado, Kansas, Illinois, Louisiana, Missouri, Nebraska, Oklahoma, Texas and Wyoming. We’re still working out the details of overnight and whistle stops along the way, but we can tell you the Big Boy will be on display at the following locations:
Saturday, Aug. 14: Fort Worth, Texas
Tuesday, Aug. 17: Houston, Texas
Saturday, Aug. 21: New Orleans, Louisiana
Sunday, Aug. 29: St. Louis, Missouri
Monday, Sept. 6: Denver, Colorado
Following the Denver stop on Labor Day weekend, the Big Boy and its crew will return to Cheyenne.
Looks like the East Coast needs to travel a bit to see it