Another difference between the "industrial" and "common carrier" models is the electrical system. The 45-ton (siderod) unit at OERM has a 24-volt battery system, typical of heavy duty diesel trucks. The 44-ton (four motors) has a 70-volt battery, like its "big brothers", all the way up to our Santa Fe FP45. Pacific Electric used GE 44-ton units on their freight trains in the 1940's; I recall seeing one going through Monrovia taking empty gravel cars to Azusa. I suspect they were running that engine to the outer limits of its capability. The GE's were soon replaced by Baldwin and EMD end-cab switchers (OERM has an EMD SW-1 that served on PE for a while).

Back around 1980, Montgomery Ward had a TV ad showing one of their car batteries supposedly giving a "jump-start" to an "18-wheeler". At the time my older daughter worked for Sears, and I took a photo of my pickup truck with a Sears battery jump-starting the 45-ton diesel (another member out of the picture had jumper cables from his car, which also had a Sears, to the other half of the 24-volt battery hookup). So if anybody asked, she could assure them, never mind the big-rigs--Sears batteries jump-start railroad locomotives!