BAR 631 (formerly #73; BAR’s (US) bicentennial locomotive) is the sole survivor of that railroad’s fleet of GP7s. It was kept in service because the BAR wanted to keep one GP7 around for railfans and special trains, as well as for sentimental reasons.
It operated as a GP7 until 2016, then was sent up to ILW to be reengined with a Tier 4F prime mover (a Cummins QSK50 producing 2130 HP), and came back painted in an approximation of the BAR’s bicentennial paint scheme.
In 2024, a small pile of EMD & GMD geeps joined the roster with the Parsons Vale’s purchase of the Ottawa Valley Railway. These units are slowly being rebuilt into GP7d’s, but the ones that haven’t are classified into a bewildering number of DL19 subclasses.