DD35 - MagnumMacKivler/RLCPT2 GitHub Wiki
A SP DD35 locomotive, set out on a bad order in Fontana, California, sits on an October afternoon in 1976. Photo credit Sid Vaught
The DD35 is an 8 axle locomotive variant of the GP35 and SD35. The Dual Diesel 35 series (DD35) locomotive used two turbocharged 567 engines, and each one powered one 4 axle truck (essentially like a GP35 in each truck assembly). These locomotives, designed to compete with the C855 and U50, were made for longer and faster freight trains, primarily on the Union Pacific. However, Southern Pacific also was interested in the double diesel concept, and purchased DD35s as well. DD35s were cabless booster units, and designed to compliment other locomotives on freight trains.
A tired looking, now 12 year old UP DD35A (the only purchaser of the DD35A) takes a rest in Las Vegas, Nevada in 1977. Photo credit John Wiesmann
The DD35A locomotive was a DD35 locomotive type exclusively for Union Pacific, and had a cab put on one end. Together, DD35s and DD35As were made between 1963 to 1965. 3 DD35 cabless locomotives went to the Southern Pacific railroad, while the other 27 DD35 and 15 DD35A locomotives went to the Union Pacific.
The DD35A was later superseded by the DDA40X, and was going to be surpassed by the DD40A that was never built.
PT-Specific Information
| General Info | - |
|---|---|
| Prime Mover | 2x EMD 16-567D3A |
| Horsepower | 5000 |
| Truck Type | EMD "Flexicoil" D |
| Axles | 8 |
| Traction Motors | 8 |
| Minimum Weight | 510,000 lbs.⚠ |
| Maximum Weight | 540,000 lbs. ⚠ |
| Model Base Speed | 71 MPH |
| Top Speed | 71, 77, or 83 MPH |
| Electrical System | - |
|---|---|
| Generator Max Current | 6000 Amps |
| Max Traction Motor (TM) Current | 1500 Amps |
| Max Continuous TM Current | 1000 Amps |
| Traction Motor Type | DC |
| Factor of Adhesion | 25% |
| Transition Mode | Automatic with Selector |
| Transition Groups | 2, 2, 2, 2, 2, 2, 2, 2, 4, 4, 4, 4, 4, 4 |
| Transition Shunts | 1, 0.8, 0.65, 0.56, 0.49, 0.43, 0.39, 0.35, 1, 0.8, 0.65, 0.56, 0.49, 0.39 |
| Generator Transition | No |
| Traction Control | APR with sanding |
| Dynamic Braking (DB) Mode (if used) | Mechanical Blowers |
| DB Max Current | 700 Amps |
| DB Max Continuous Current | 700 Amps |
| Blended Braking | No |
| Miscellaneous | - |
|---|---|
| Head-End Power (HEP) | No |
| HEP Power Consumption | N/A |
| HEP Standby/Run Mode | N/A |
| Load Ramp Speed | 2 Amps/Tick |
| TM Overload Protection | No |
| Starter Mode | Manual Primer, Manual Start |
| Air Brake Schedule | 26L (1) |
| Compressor CFM | 254 (WBO @ 900 RPM) |
| Main Reservoir Volume | 28.4 Cubic Feet |
Notes:
(1) 6BL or 24RL were optional
⚠: Not Verified or Educated Guess