No doubt this has been answered before but since I am new please excuse my re-asking. I live on the BNSF mainline through central California's San Joaquin Valley. I noticed the GE Dash 9-44 CW are almost exclusively used on this route. My question is what is the difference between the Dash 9 with two large (air?) tanks located on top of a cutout above the fuel tanks and the other style without these tanks? I hope someone knows what I mean.
GE Dash 9-44 CW - Trains Magazine
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