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SD40-2
| Production Dates |
January 1972 to Feburary 1986 |
| Total Built |
3,945 |
| Length |
68 feet 10 inches |
| Engine |
16-645E3C |
| Horsepower |
3,000 |
| Alternator |
AR10 |
| Traction Motors |
D77/78 |
| Weight |
368,000 |
The SD40-2 has 3 feet radiator fans.


SD40T-2

| Production Dates |
June 1974 to July 1980 |
| Total Built |
312 |
| Length |
68 feet 10 inches |
| Engine |
16-645E3C |
| Horsepower |
3,000 |
| Alternator |
AR10 |
| Traction Motors |
D77 |
| Weight |
388,000-410,000 |
The SD40T-2 has a Tunnel Motor radiator section.


SD40-2F

| Production Dates |
November 1988 |
| Total Built |
25 |
| Length |
68 feet 10 inches |
| Engine |
16-645E3M |
| Horsepower |
3,000 |
| Alternator |
AR10 |
| Traction Motors |
D77 |
| Weight |
389,000 |
The SD40-2F comes with a full-cowl carbody and a comfort cab.
SD40
| Production Dates |
January 1966 to July 1972 |
| Total Built |
1,275 |
| Engine |
16-645E3 |
| Horsepower |
3,000 |
SDP40F
| Production Dates |
June 1973 to August 1974 |
| Total Built |
150 |
| Length |
72 feet 4 inches |
| Engine |
16-645E3 |
| Horsepower |
3,000 |
| Alternator |
AR10 |
| Traction Motors |
D77/78 |
| Weight |
396,000-400,000 |
Similar to the FP45 except it does not have the front platform and stairwell. It
has HT-C trucks.
SD40-3 pictured below.

SD40M-2 pictured below.

SD40u pictured below.
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