This is Rock Island's version of EMD's BL2. BL stood for "branch line" because the unit was lighter than an F-unit and much easier to work with (i.e., steps on all corners). In a sense they were a... (more)
I have no idea what those people down there were doing. The SD7 however was ex-CB&Q 309. The dinkey is inbound just minutes from leaving Aurora has a generator car on the rear.