The EMD SD70 is a series of diesel-electric locomotives produced by the US company Electro-Motive Diesel in response to the GE Dash 9-44CW. Production commenced in late 1992[1][page needed] and since then over 5,700 units have been produced; most of these are the SD70M and SD70MAC models. While the majority of the production was ordered for use in North America, various models of the series have been used worldwide. All locomotives of this series are hood units with C-C trucks, except the SD70ACe-P4 (and presumably the SD70MACH as well) which has a B1-1B wheel configuration, and the SD70ACe-BB, which has a B-B-B-B wheel arrangement.
EMD SD70 series
Norfolk Southern SD70 (378889478).jpg
Norfolk Southern SD70 No. 2562
Type and origin
Power type
Diesel-electric
Builder
Electro-Motive Diesel (EMD)
Model
SD70, SD70I, SD70M, SD70M-2, SD70AC, SD70MAC, SD70ACe, SD70ACe/LCi, SD70ACS, SD70ACe-T4, SD70ACe-BB, SD70ACe/45, SD70IAC, SD70ACe/LW, SD70ACU, SD70ACC, SD70MACH, SD70MACe
Build date
1992-present
Total produced
SD70: 122
SD70I: 26
SD70M: 1,609
SD70M-2: 331
SD70MAC: 1,109
SD70ACe: 2,091
SD70ACe/lc: 194
SD70ACS: 38
SD70ACe-T4: 143
SD70ACe-BB: 80
SD70ACe/45: 80
Specifications
Configuration:
* AAR
C-C (B+B-B+B for SD70ACe-BB)
* UIC
Co'Co' (Bo'Bo'Bo'Bo' for SD70ACe-BB)
* Commonwealth
Co-Co (Bo+Bo-Bo+Bo for SD70ACe-BB)
Gauge
4 ft 8+1⁄2 in (1,435 mm) standard gauge for the North American market;
1,600 mm (5 ft 3 in) for Brazil;
1,000 mm (3 ft 3+3⁄8 in) for Brazil and Guinea
Trucks
EMD HTCR-Ia: SD70, SD70I, SD70M, SD70MAC;
EMD HTCR-Ib: SD70I, SD70M, SD70MAC, SD70ACU;
EMD HTCR-4: SD70M, SD70MAC, SD70ACe;
EMD HTCR-6: SD70ACe, SD70ACe-T4;
EMD HTSC-II: SD70M, SD70ACe, SD70ACe/LCi, SD70ACS, SD70ACe/45;
EMD GBB: SD70ACe-BB
Prime mover
EMD 16-710-G3 2-stroke diesel;
EMD 12-1010J 4-stroke diesel for SD70ACe-T4
Engine type
V16;
V12 for SD70ACe-T4
Cylinders
16
12 for SD70ACe-T4
Transmission
Diesel electric
Performance figures
Maximum speed
70 mph (110 km/h), 75 mph (121 km/h) for the SD70ACe-T4
Career
Nicknames
Vacuum Cleaners (SD70ACe-T4) Thundercabs (Early SD70Ace models)
Disposition
Many operational, several retired due to wrecks or Thundercab issue, one to be preserved.
Superseding the HT-C truck, a new bolsterless radial HTCR truck was fitted to all EMD SD70s built 1992-2002; in 2003 the non-radial HTSC truck (basically the HTCR made less costly by removing radial components) was made standard on the SD70ACe and SD70M-2 models; the radial HTCR truck remained available as an option. read more