GP8 Technical Information

The Conrail GP8 and GP10 fleet originally began their lives as EMD GP7 and GP9's built for a variety of roads in the early fifties. Conrail, with hundreds of units lined up in graveyards and in dire need for reliable power decided to begin a GP rebuild program.

The railroad selected the Illinois Central Gulf RR's Paducah, KY shop to perform the work in 1976. At Paducah, the short hood high noses were chopped for better visibilty and the control stands were set up for the new short hood lead operation. The prime movers were overhauled and all former GP7's received the 567BC while the GP9's received 567C's. Air filter work was also performed, outfitting the new Geeps with Dynacell paper air filters.

Nine GP8 units were turned out during the third quarter of 1976 wearing new CR paint and road numbers 5720-5728. Sixteen GP10's were released as well sporting CR paint and numbered 7560-7575.

By 1978, Conrail desired more from the rebuild program and selected another 39 GP7's to be rebuilt. This program was not as extensive as the original consisting of only mechanical and electrical work. The dynamic brakes were removed, and the control stand remained setup for long hood forward operation. Paducah was not the only shop contracted this time around. The work was split between Chicago, Rock Island & Pacific's Silvis, IL shop, Morrison Knudsen's Boise, ID shop and ICG Paducah. The units were returned to Conrail during the third quarter of 1978 wearing 5400 series CR road numbers. The 1976 batch (5720-5728) were subsequently renumbered 5400-5408.

59 GP9's were also sent out for rebuilding in 1978 split between Paducah, Morrison Knudsen and Precision National Corporation in Mount Vernon, IL. This was the first rebuilding program PNC had undertaken and after the 6th unit, Conrail terminated the PNC contract due to quality and delivery issues. The remainder of PNC's contract was given to Paducah for completion. The same work, electrical and mechanical, was done and by early 1979 Morrison Knudsen turned out 17 units (7513-7529), PNC 6 (7530-7537) and 36 from Paducah (7545-7597). Road numbers 7532, 7536, 7538-7544, 5414-5427 were never used.

The GP8's lasted well into the 1990's and though most all were stored in the mid 80's, all but 1 were reactivated in 1987 when a batch of GP38-2's went off lease. The units were again returned to storage until 1989 when less than a dozen were reactivated again to make up for the loss of 10 MP15's that were returned to their lessor. This was the last active group until April 11, 1991 when the entire class was retired.

GP8 / GP10 Historical Photo Gallery (1976 - 1998)

GP8 / GP10 Survivors Photo Gallery (Post 1999)

General

Built 1950-1953
Rebuilt 1976, 1978
Weight- 249,000lbs
Maximum Curvature Per Single Unit- 39°

Engine

Model- 16-567C or BC
Main Generator- D12B
Traction Motors- D27

Performance

Horsepower- 1500
Maximum Continuous Tractive Effort- 40,000lbs
Minimum Continuous Speed- 11mph

Capacities

Fuel- Units
5400, 5407, 5428-5431, 5439, 5440, 5462- 1600 gallons
5401-5405, 5408, 5409, 5411-5413, 5435-5438, 5442-5448, 5460, 5461- 800 gallons
5406- 1100 gallons
5460, 5461- 1200 gallons
5410, 5433-5434, 5441, 5449- 1700 gallons

Air Brake Equipment

Schedule- Units
5400-5408, 5430-5449, 5455, 5457- 26L
5413, 5428-5429, 5460-5462- 24RL
5409-5412, 5450-5454- 6SL
5456, 5458-5459- 6BL

Trucks

Gear Ratio- 15:62

Special Features

5407, 5428-5431 Cab Signal Equipped
Snow Plow- Both End, 5413, 5430, 5435, 5439-5441, 5445, 5446
Allignment Control Coupler- As of 1986, units 5400-5413, 5432-5443, 5449-5453, 5458, and 5460-5461 were cleared for removable neoprene coupler stops, while 5428-5431 could have various other designs

Roster 

CR # Previous # Builders # Build Date Rebuild Release Date Other
5400 CR 5720 18749 10-1953 9-30-76 Ex CR 5836, nee RDG 634
5401 CR 5721 15460 3-1952 10-20-76 Ex CR 5620, ex P&E 5620, ex NYC 5620:2 nee NYC 5681
5402 CR 5722 12999 11-1950 10-29-76 Ex CR 5613, nee P&E 5613
5403 CR 5723 13005 12-1950 11-9-76 Ex CR 5619, nee P&E 5619
5404 CR 5724 12011 12-1950 11-11-76 Ex CR 5947, ex EL 1217, nee Erie 1217
5405 CR 5725 13000 11-1950 11-15-76 Ex CR 5614, nee P&E 5614
5406 CR 5726 17892 2-1953 12-13-76 Ex CR 5927, ex EL 1407, nee D&LW 968
5407 CR 5728 18635 8-1953 12-13-76 Ex CR 5856, ex PC 5856 ex PRR 5856, nee PRR 8556
5408 CR 5729 12008 12-1950 12-15-76 Ex CR 5944, ex EL 1214, nee Erie 1214
5409 CR 5622 13008 12-1950 7-19-78 Nee P&E 5622
5410 CR 5624 13010 12-1950 7-29-78 Nee P&E 5624
5411 CR 5744 18448 5-1953 8-26-78 Ex PC 5744, nee NYC 5744
5412 CR 5804 18508 6-1953 9-15-78 Ex PC 5804, nee NYC 5804
5413 CR 5813 18423 5-1953 11-4-78 Nee RDG 623
5428 CR 5874 18653 9-1953 8-2-78 Ex PC 5874, ex PRR 5874, nee PRR 8574
5429 CR 5879 18658 9-1953 9-22-78 Ex PC 5879, ex PRR 5879, nee PRR 8579
5430 CR 5860 18639 9-1953 10-3-78 Ex PC 5860, ex PRR 5860, nee PRR 8560
5431 CR 5861 18640 9-1953 12-30-78 Ex PC 561, ex PRR 5861, nee PRR 8561
5433 CR 5639 14201 8-1951 12-5-78 Ex PC 5639, nee NYC 5639
5434 CR 5631 18517 7-1951 11-27-78 Ex PC 5631, ex NYC 5631:2, nee NYC 5813
5435 CR 5662 14224 10-1951 11-17-78 Ex PC 5662, nee NYC 5662
5436 CR 5621 13007 12-1950 2-1-79 Nee P&E 5621
5437 CR 5618 13004 12-1950 1-19-79 Nee P&E 5618
5438 CR 5615 13001 11-1950 1-26-79 Nee P&E 5615
5439 CR 5835 18758 10-1953 10-26-78 Nee RDG 633
5440 CR 5786 18490 6-1953 10-14-78 Ex PC 5786, nee NYC 5786
5441 CR 5660 14222 10-1951 10-6-78 Ex PC 5660, nee NYC 5660
5442 CR 5962 12242 3-1951 9-19-78 Ex EL 1224, nee Erie 1224
5443 CR 5961 12017 12-1950 12-27-78 Ex EL 1223, nee Erie 1223
5444 CR 5946 12010 12-1950 12-23-78 Ex EL 1216, nee Erie 1216
5445 CR 5941 12005 10-1950 11-14-78 Ex EL 1211, nee Erie 1211
5446 CR 5939 11841 10-1950 11-14-78 Ex EL 1209, nee Erie 1209
5447 CR 5937 11839 10-1950 12-19-78 Ex EL 1207, nee Erie 1207
5448 CR 5936 11838 10-1950 9-10-78 Ex EL 1206, nee Erie 1206
5449 CR 5625 13011 12-1950 9-10-78 Nee P&E 5625
5450 CR 5607 9234 8-1950 10-2-78 Ex PC 5607, nee NYC 5607
5451 CR 5617 13003 11-1950 11-8-78 Nee P&E 5617
5452 CR 5628 14190 7-1951 10-24-78 Ex PC 5628, nee NYC 5628
5453 CR 5912 18478 6-1953 9-8-78 Ex PC 5912, ex NYC 5912, nee NYC 5774
5454 CR 5922 12020 12-1950 10-27-78 Ex EL 1403, nee Erie 1403
5455 CR 5932 11834 10-1950 9-26-78 Ex EL 1202, nee Erie 1202
5456 CR 5933 11835 10-1950 10-18-78 Ex EL 1203, nee Erie 1203
5457 CR 5934 11836 10-1950 9-20-78 Ex EL 1204, nee Erie 1204
5458 CR 5979 16933 9-1952 11-14-78 Ex EL 1241, nee Erie 1241
5459 CR 5930 11823 8-1950 10-10-78 Ex EL 1200, nee Erie 1200
5460 CR 5993 15720 4-1952 11-2-78 Ex EL 1278, nee DL&W 959
5461 CR 5991 15718 4-1952 12-18-78 Ex EL 1276, nee DL&W 957
5462 CR 5838 18751 10-1953 12-6-78 Nee RDG 636

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