The D&RGW used SD’s hooked up with F’s, with the lash-up referred to as a Perlman Mallet. The F’s were usually the controlling locomotives as traction motor heating was more pronounced with 4 axle units than 6 axle units.
The D&RGW used SD’s hooked up with F’s, with the lash-up referred to as a Perlman Mallet. The F’s were usually the controlling locomotives as traction motor heating was more pronounced with 4 axle units than 6 axle units.