The ALCO C424 model was one of the first “Century-series” locomotives to be produced. Its 16-cylinder 251B-series prime mover produced 2,400-hp, making it a direct competitor to the 2,500-hp GE U25B and EMD GP35 models. A total of 190 units were built between 1963 and 1966 for customers throughout North America, including 53 for roads in the US, 92 for Canada and 45 for Mexico. Erie Lackawanna, Canadian Pacific and National de Mexico purchased some of the largest fleets in their respective countries.
By late 1964 ALCO had determined that an extra 100-hp did make a difference to some customers, and the 2,500-hp C425 model was the result. Improvements over the C424 included a higher capacity main generator, a simplified electrical control system, increased radiator capacity and an upgraded 251C prime mover. The appearance of the body was nearly identical to the C424, with one major exception being the addition of a bulge above the radiator intake grille at the rear of the long hood. A total of 90 units were produced between late 1964 and 1966, all for US roads. The largest purchases were made by Pennsylvania and Spokane Portland & Seattle.
C425 Phase 2 models include cab with either horizontal or vertical headlights per the prototype
Models include redesigned “AAR” style truck sideframes with separate brake cylinders and separate bearing cap detail (included when appropriate per the prototype).
Directional lighting w/ golden-white LEDs
Five-pole skewed armature motor with dual flywheels for optimum performance at all speeds
Factory-equipped with AccuMate® knuckle couplers
Analog version features NMRA 8 pin plug for DCC
Separately-applied wire grab irons, ladders, and drop steps
Separately-applied marker lenses
Improved painting and printing w/painted handrails
Two painted crew members
DCC Ready Operation:
The LokSound Select Dual-Mode decoder allows your Atlas Gold Series locomotive to be used on DC as well as on DCC layouts.
Please note that the Atlas Quantum Engineer will NOT operate an Atlas Gold Series locomotive equipped with a LokSound Select decoder on an analog (DC) layout. However, the sound and lighting functions of the LokSound Select decoder in the Atlas Gold Series C424/425 locomotive can be controlled by an easy-to-use basic DCC system
Also note that on a DC-powered layout, a DCC and sound equipped locomotive (such as the Atlas Gold Series C424/425) CANNOT be consisted with another locomotive that does not also have both DCC and sound. (This statement does NOT apply to DCC-equipped locomotives operating on a DCC layout.)