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GP40-2
| Production Dates |
April 1972 to November 1986 |
| Total Built |
903 |
| Length |
59 feet 2 inches |
| Engine |
16-645E3 |
| Horsepower |
3,000 |
| Alternator |
AR10 |
| Traction Motors |
D77B |
| Weight |
257,000-282,000 |
The GP40-2 has 3 radiator fans along with a single exhaust stack.

GP40
| Production Dates |
November 1965 to December 1971 |
| Total Built |
1,221 |
| Engine |
16-645E3 |
| Horsepower |
3,000 |
GP40X

| Production Dates |
December 1977 to June 1978 |
| Total Built |
23 |
| Length |
60 feet 2 inches |
| Engine |
16-645F3 |
| Horsepower |
3,500 |
| Alternator |
AR10 |
| Traction Motors |
D87X |
| Weight |
274,000-278,000 |
SP and UP units built with experimental HT-B high-adhesion trucks.
GP40E pictured below.

GP40M pictured below.
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