About as rare as it gets these days....
Yes, what you are looking at is Union Pacific Engine #1988, the Missouri-Kansas-Texas "The Katy" Heritage Locomotive leading Norfolk Southern train 13Z over the Potomac River.
This is the first time this unit has lead a train in either Maryland or West Virginia!
Not
just heritage schemes, not just commemorative schemes - this album is devoted to some of the world's most interesting paint schemes, past or present.