Of the 13 U23B’s that made the merger, all
were removed from service and stored unserviceable, finally ending
up at North Little Rock waiting for their lease to expire on
September 1, 1987. After expiration the units were returned to
lessor (First Security Bank of Utah) who sold them for scrap.
In March 1989 GE began rebuilding retired B- and C-trucks GE locomotives into what they called their "Super 7" series locomotives. The rebuilt units are former GE U-series and -7 series locomotive frames with new technology Dash 8 components, including all-new car body hoods and cabs. The first completed were Super 7 23Bs GECX 2000-2002 rebuilt from retired WP U23Bs 2263, 2251, 2257. GECX 2000 was completed at GE-Erie as a prototype for the rebuild program, with GECX 2001 and 2002 car body work completed at Morrison Knudsen in Boise, Idaho. The installation of the components for 2001 and 2002 was done at Erie. All subsequent Super 7 work was completed at GE’s new shop in Montreal, Canada, in the former shop of the Montreal Locomotive Works. The first unit completed at Montreal was Monongahela 2300, ex WP 2254.
Monongahela Railway was incorporated in 1900 jointly by Pennsylvania and Pittsburgh & Lake Erie. In 1925 Baltimore & Ohio was admitted and ownership split into thirds. P&LE sold its third to Conrail in 1989, and B&O successor CSX did the same a year later. Conrail absorbed Monongahela in 1992.
Conrail acquired the11 "Super 7" B23-7R locomotives with the coal hauling Monongahela Railway in 1992. The locomotives were rebuilt for the Monongahela by General Electric from Western Pacific U23-B's in 1989. These unique locomotive have modern dash 8 style carbodies. However, they still ride on the EMD Blomberg trucks from retired F-Units they were initially delivered with to the Western Pacific as U23B's in 1972.