A pair of Union Pacific SD70M motors sit in the yard in LaSalle, Colorado.

The Union Pacific 4006 Big Boy is one of many steam locomotives on display at the National Museum of Transportation.

Union Pacific Big Boy 4006 and Union Pacific 6944 on display at the National Museum of Transportation.

Got 80 Gallons? On July 14, 2009, Union Pacific Railroad "Big Boy" 4006 (4-8-8-4, Alco, 1941) was sitting on a display track at The National Museum of Tranportation in St. Louis, ... (more)

Southbound Union Pacific no. 4006 leads a Herzog ballast train down the Santa Barbara Subdivision at Emma Wood State Park.

A look inside the cab of UP Big Boy steam locomotive No. 4006

Southbound 213 splits the signals at Traber, located a short distance southwest of Liberty, SC.

UP "Big Boy" 4006 sits on display at the Museum of Transportation.

Big Boys 4006 makes a run for Sherman hill.

Union Pacific 4-8-8-4 Big Boy #4006

It's not quite 8 am and Union Pacific Big Boy #4006 basks in the glow of the early morning light at the St Louis Museum of Transportation. With no luck... (more)

UP Big Boy 4006 sits on display in St. Louis, MO

My 6'0 buddy is dwarfed by the UP Big Boy.

Union Pacific Big Boy #4006 sits on display at the Museum of Transportation. This engine type, built strictly for the Union Pacific is well represented as 8 of the 25 built survived the torch to ... (more)

The Massive UP Big Boy is the Centerpiece of the NTM collection

North bound UP 4006 leading UP 4271 runs along the basalt lava flows and the Portneuf River, south of Inkom. Pocatello is only ten miles distant and then on to the northwest. This pair of SD70M's ... (more)