@RJ I posted:
Well, if we are going with extreme technicalities, EMD did not only use dashes for the "Dash 2" series, CSX has several Dash 3 locomotives such as the SD40-3 and SD50-3.
This is not a matter of "...extreme technicalities..." It's a matter of getting an EMD model number RIGHT or WRONG. It's like the difference between driving a Chevy Impala or an Impoola. One is right, the other is wrong. It's really that simple.
And for the record, EMD never produced a "Dash 3" locomotive series. As Hot Water pointed out, the "Dash 3" locomotives were re-manufactured and upgraded models done in the field, not at the factory.