As "NUMBER 90", i.e. Tom indicated above, all the EMD SD70MAC units were delivered with Speed Control. All the Engineer has to do is select "Speed Control" on his desk-top computer and then use the small rocker switch on the desk-top to increase or decrease the desired speed, in 10ths of a mile an hour, and the unit/units do the rest. I've been on many Powder River Coal Basin coal trains while being loaded, usually at 0.4 to 0.6 MPH, as the 125 to 135 bathtub gons are flood-loaded, and the tonnage simply keeps increasing. The "Speed Control" takes care of everything, even increasing engine RPM in order to maintain steady and smooth power.
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