Re: the CP Rail MoW cowl GP38
I think Speno, the rail grinding contractor, bought some units with GP-38 prime movers (= non-turbo 16-645) in carbides very similar to the FP40, for use on their rail reprofiling trains. EMD delivered them with FP-40 cabs, but Speno soon rebuilt them with extended cab fronts (to give extra room in the cab?): I wonder if this CP unit is ex-Speno.
Again courtesy of George Elwood's marvellous site, one of the SPENO units:
(Comments: (i). Photo taken after the cab was extended, and the nose is not like that on the CP unit. So perhaps CP's unit was converted from a stock GP-38-2 by CP, and is not an ex-SPENO unit.
(ii) EMD apparently called the SPENO units "F40m." I don't know whether the auxiliary generator used to provide power to the rail-grinding equipment was the same as that used for h.e.p. on passenger F40: if it was, the designation makes sense, even though the 2000 hp non-turbocharged prime mover ought, by what little logic EMD's model designations have, to have made it a 38 model rather than a 40 model.)