Union Pacific is the oldest and largest operating railroad in the United States.
And they have beautiful train livery, like the one in this photo, seen at the Illinois Railway Museum in Union, Illinois. UP 18 is a gas turbine-electric locomotive the company donated to the museum.
From Wikipedia: “UP’s basic paint scheme for its diesel-electric locomotives is the oldest still in use by a major railroad. The bottom two-thirds of the locomotive body is painted Armour Yellow, so-named because it was the color used by the Armour meat company. A thin band of red divides this from the Harbor Mist Gray (a fairly light gray) used for the body and roof above that point.”