1954 || 2 ( 1 ea cab and booster) ||B-B || CB 12 cyl || || |- align = "center" | GE GEX3341|| 1954–1966 || 11 White Pass and Yukon Route || C-C || ALCO 6-251 || || |} Universal Series (1956 to 1998) Four axle Six axle Six axle & Pony Eight axle Dash 7 Series (introduced 1977) Models with "A" suffix are equipped with 12-cylinder prime mover in place of the standard 16-cylinder version, with the same power output. Four axle Six axle Dash 8 Series (introduced 1982) GE originally introduced this series with the model designation following the pattern of the Dash-7 line. After product improvements were made to the line in 1987 the official designations for models in this series changed to "Dash-8...", as shown in the list below. However, for simplicity, many railroads decided to use designations which follow the pattern of the Dash-7 line. Thus, for example, the Dash 8-40C is usually rendered as "C40-8". The "W" suffix indicates the then-optional wide-nose "North American" safety cab. For example, the Santa Fe used the designation "B40-8W" for GE's "Dash 8-40BW". The railroad continued this practice until its merger with the Burlington Northern Railroad in 1995, and the new railroad, Burlington Northern-Santa Fe (later BNSF Railway) furthered the practice. Introduced during the Dash 8's later years were split-cooling in the radiators and electronic displays for the crews (instead of analogue gauges). Four axle Six axle Eight axle Dash 9 Series (introduced 1993) The Dash 9 series introduced primarily electronics updates to the Dash 8 line. Also introduced was the HiAd (High-Adhesion) truck. Split-cooling was standard. Four axle No four axle freight versions produced Six axle Eight axle AC Series (introduced 1994) These feature the same carbody design and many of the internal components as the Dash-9 series, except they are equipped with AC traction motors instead of the conventional DC versions. The cab air conditioner was moved from the left (conductor's) side walkway to a position under the cab floor to make space for the six traction inverters (one per axle) that supply the AC current to the traction motors. Six axle *Note: two versions: one contained a 16-cylinder 7HDL, co-developed by GE and the German firm Deutz-MWM, rated at 6000 HP; the other a 16-cylinder 7FDL rated at 4390 HP. The units equipped with the 7FDL were a sub-version AC6000 "Convertible" and were produced to