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[quote user="cascadenorthernrr"] Are there any additional types of road power? Or a unit that would be located in a lashup of diesels? Like a C-unit? <div style="clear:both;"> </div> [/quote] A unit and B units are a hold over reference from the covered wagons (for example: EMD F series).  Almost all diesel locomotives now have cabs.  There are no "C units".   There where several different railroads that purchased B unit (cabless) versions of EMD and GE road switchers.   The problem with B units is that I there is some sort of failure on the Cab equipped unit that prevents it from being a leader (broken window, headlight fails...those might be the only two), you cant use a B unit as a lead unit.  Its actually cheaper in the long run to have all cab equipped units due to the operational flexibility.  In some classification yards (both hump and flat yards) there are remote control diesel locomotives.  These are identified by special warning placards and flashing orange lights (the ones ive seen on CSX and NS have a special light bar with 2 or three orange lights on them).  These locomotives are controlled by one man on the ground who makes the switching moves and uncouples cars.  As far as wheel arrangement: 6 axle diesels with 6 traction motors are classified as C-C.  4 axle with 4 traction motors are B-B.  6 axle with only four traction motors (such as EMD E passenger units) are classified as A1A-A1A.   EMD FL9 is a B-A1A Hopefully this clears some things up.
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