The GE Dash 8-40B (also known as B40-8) is a 4-axle diesel-electric locomotive produced by GE Transportation during the years 1988 to 1989. It belongs to the GE Dash 8 Series of freight locomotives.
A total of 151 units of this locomotive model were manufactured for use by North American railroads.
Additionally, there is a variation called the GE Dash 8-40BW (B40-8W), featuring a full-width cab. Another variant is the GE Dash 8-40BP, more commonly referred to as the Genesis series. The locomotives in the Genesis series include the P40DC, P42DC, and P32AC-DM models.
Here are the original owners of the GE Dash 8-40B locomotives:
- Atchison, Topeka and Santa Fe Railway: 40 units with road numbers 7410-7449.
- Conrail: 30 units with road numbers 5060-5089.
- General Electric: 1 unit with road number 8002.
- New York, Susquehanna and Western Railway: 24 units with even-numbered road numbers 4002-4048.
- St. Louis Southwestern Railway: 55 units with road numbers 8040-8094.
- United States Department of Energy (Savannah River Site): 1 unit with road number 107.
In July 2014, Union Pacific #1848, formerly known as St. Louis Southwestern #8049, was generously donated by the Union Pacific Railroad to the Illinois Railway Museum for preservation.