-Rebuilt by Precision National, Cumberland and Huntington shops from GP9s; 1055, 1063, 1064 rebuilt from GP7s. Equivalent of GP38-2 in yard service (traction).
RDSLUGS 2200-2330
-RDSLUGs 2200-2330 rebuilt from GP30/GP35
-2207 rebuilt from GP40 6723, 2244 rebuilt from GP40 6658
-Delivered between 1988-1990
-2200-2279 rebuilt by Precision National at Mt. Vernon, IL and by Morrison-Knudsen at Boise, Idaho
-2280-2331 rebuilt by Morrison-Knudsen at Mountain Top, PA
-2200 delivered in CSX's blue & grey scheme
-2201-2279 delivered in CSX's stealth scheme
-2280-2330 delivered in YN2 paint
-Number 2302 skipped due to retired SBD/CSX GP7 #2302 still being in the CSX computer system
-2241 retired 6-1-95 (leaving one GP40-2 mother slugless - currently 6440 is operating solo)
-2283 stored in Huntington, WV due to wreck damage, formerly mated with 6417
-2216 formerly mated with 6440, now mated with 6417 replacing 2283
-2295 retired with mother 6910 in November 2003 due to wreck damage
RDMATES 2331-2350
-RDSLUGs 2331-2350 rebuilt from GP38/GP40
-Rebuilt in 1998 by VMV at Paducah, KY
-These units are actually labeled RDMATE as opposed to the earlier RDSLUG
-All units delivered in YN2 paint
-2348 out of service due to wreck damage, mother 2501 operating alone
-2350 out of service due to wreck damage, mother 2503 operating alone
Key to RDSlug/RDMate Histories
Former slug numbers without reporting marks present are former CSX numbers
-4039-4093 former SBD GP30 (SBD 1306-1396)
-4097-4104 former C&O GP30 (C&O 3007-3041)
-4105-4140 former B&O GP30 (B&O 6900-6974)
-4301-4323 former SBD GP35 (SBD 1103-1126)
-4341-4424 former B&O, C&O, WM GP35 (B&O, C&O, WM 3500-3584)
-2236 rebuilt from Southern Pacific GP35 6658
-2250-2264 rebuilt from former Illinois Central Gulf (GM&O) GP30 in the ICG 2250-2279 block
GP40-2s 6400-6499, 6900-6943, 6947
-Rebuilt between 1988-1990 by VMV in Paducah, KY. 6466, only mother unit out shopped by Precision National
-Strangely, CSX 6466 was first to be out shopped in September of 1988. It was paired with 2200
-Units in the 6400-6483 block retained their current CSX paint when converted to mother units. Units that were in predecessor paint were repainted into CSX stealth paint when converted
-6484-6498, 6900-6901, 6903-6924, 6926-6935, 6937-6943 were repainted into YN2 paint when converted, while 6499 retained stealth paint, and 6902, 6925, 6936 and 6947 retained blue and grey paint.
-6417 formerly mated with 2283. 2283 suffered wreck damage and has been replaced by 2216
-6440 has no slug; it was formerly mated with 2216, which replaced 2283 accompanying 6417
-6910 and slug 2295 retired due to wreck damage in November 2003
-Originally, CSX planned to add ten more mothers to it's fleet. They would be numbered 6944-6953, coming from GP40-2s 6276, 6279, 6280, 6285, 6295, 6296, 6297, 6300, 6301, and 6318 respectively. However, the only one that was converted, before this order was called off, was GP40-2 6285, becoming 6947; thus, creating a gap between 6943 and 6947. The other 9 GP40-2s still retain their original CSX numbers today.