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Barry - news about your 1940 vintage photo of Railink 1200 (numbered for the horsepower).
My first appraisal was somewhat accurate - it is quite old, one of the earliest transfer "B" units built before the hood was sloped back into the cab. And with a 1940 build date, I know of no other mainline locomotive of any type that was still active in the new millenium of that age (CPR 7024 an Alco S2 switcher built Oct.1944 was recently thought to be the oldest operating locomotive operating in Canada):

Originally 1940 EMD built TRB for Illinois Central(transfer cow-calf built from NW2 model, unit before the SW7/SW9/SW1200, cabless) it looks to me like an original "TR" unit, as later ones came with side louvres - the 1941 version of the TR1 is a good match.
Renamed and renumbered Illinois Central Gulf TRB 1026B in March 1972
Rebuilt and upgraded to SW13B number 1300B in August 1986
Became Paducah & Louisville Railroad number 1300B in 1998

..found it to be stored out-of-service for the Southern Ontario Railway (RailAmerica)(Railink) from sometime after the beginning of 2002 to 2007 and scrapped in 2008.
Likely, a search of the Branchline magazine will reveal the exact out-of-service date - another time for a project.........Dave

Railink 1200 was originally built by EMD in LaGrange, Illinois in February of 1940. It was assigned serial number 1032B.
Illinois Central/Illinois Central Gulf embarked on a capital rebuild program that included this locomotive and two sisters in the period 1971-1973, converting TR2's and NW2's to SW13's in Paducah, Kentucky.
(a capital rebuild program is really just an accounting device that allows American railroads to treat rebuilt locomotives like new investments, providing that the rebuilding cost is more than half the cost of the original locomotive)
Our SW13 got an upgraded 12 cylinder 567BC prime mover (a not so totally satisfactory conversion of the older 567B which retains the older "B" head and used a water jumper to solve the "B" engine water leakage problems), and a SEALED HOOD with a central air filtration system.
And now I know why there were no louvres on the Railink 1200 hood in your photos....D

Thanks for the information Dave.
That is interesting. I guess this unit was not here long.
Is the water jumper used to cool both units with one fan and rad??
That could be a problem on its own.
Barry.

...as I understand it, the water jumper is required with different heads on the 567 engine. This allows bypassing a head-to-block water transmission port that is not a good connection and therefore leaks.....d