To pull the growing "City" fleet, UP ordered a variety of new diesels between 1946 and 1950 when the first EMD E8s arrived. Typically run in A-B-B lash-ups, these engines, along with nearly identical E9s, were the signature power on UP's flagship trains through 1971.
 
Based on units assigned to various City trains, Walthers E8s feature authentic UP-specific details, including the road's distinctive rooftop snowshields. The models come with multiple unit numbers, and are factory-finished in authentic paint, lettering and striping to match the cars. Other features include:
 
* Revised Body Tooling
 
* See-Through Air Intake Grilles
 
* Helical Gears for Ultra-Quiet & Smooth Running
 
* Easy Multiple-Unit Operation
 
* Superb Paint & Lettering
 
* Painted Metal Grab Irons, Handrails & Lift Rings
 
* Five-Pole, Skew-Wound, High-Torque, High-Efficiency Can Motor
 
* Prototype Specific Details: Mars Light on Select Models - Dual Air Intake Grilles - Straight or Angled Number Boards - Small or Large Water Tanks as appropriate
 
* Proto MAX(TM) Metal Knuckle Couplers