Only 10 were built, and were all scrapped due to the project being a failure.
SBD was experimenting on designs to house full crew on cabooseless trains, this resulted in the BQ23-7, the Q standing for Quarters. When in their tenure at CSX, they were operated as trailing units only. The Units were scrapped in 2001, none were preserved.
- GE originally planned on modifying more of their Dash 7 units with having a "quarters" cab equipped, yet the success of the C40-8W and preceding models replaced the need for doing so.
- These units ran on traded in EMD Blomberg trucks.
- Because of how large most train crews were up until the 1980s in the US, BQ23-7s were equipped with 5 seats for crews like a caboose as opposed to having 2 on every other diesel locomotive.
- The BQ23-7 was often nicknamed the "ugly duckling" by most railfans and railroad employees.
- Several remaining BQ23-7 units (as seen in the image) were the only Family Lines/Seaboard System-painted units on CSX's roster before retirement.