UP 3083 built Aug, 1971 through, UP3804 built Nov. or Dec. 1980. (3083-3122 Ret. no date)
Then there was the Fast Forty's UP 8000 - 8099. this group of units were geared to run with the UP 6900 class DD40X's. UP3240 through 3274, were renumbered 8000-8034, regeared 69:18 80MPH. The rest came new as UP8035 to UP8099. 8035-8099 were later regeard, and renumberd in to the low end of 3300's.
Along comes the MOPAC fleet:
MP6005-6073, to UP3905-3973, these units have DB's.
MP3115-3163, to UP4115-4163, these units have no DB's.
MP3202-3321, to UP4202-4321, these units have no DB's.
A large number of these last two groups have been rebuilt in to SD38-2Rs. Only a hand full left.
Now comes the MKT fleet:
MKT600-636, to UP3809-3844.
Now comes the CNW fleet:
mix bag of 6800, and 6900 to UP3015-3098.
CNW 6800class to UP2952-2999.
Total around 865 units + or - .