Locomotive Phases - EMD SD38, SD39, SD40, SD45
These phases are based on the SD45 roster compiled by David Thompson, with added details based on what I have observed. I have relabelled Thompson's Phase 2b1 as a variation of Phase 2a (Phase 2a3) since the single change in this phase (U-shaped nose grabirons) actually appeared on some earlier units as well. However, there are still two Phase 2b variations, since I have added a subphase for revised traction motor cable routing that appeared in the middle of Phase 2b.
These phases are very similar to those for the GP38 through GP40.
|Cab sub-base doors||Smooth||Ribs on conductor's side||Ribs on both sides||Ribs made full-width (rather than ending before door edges)|
|Handbrake||Short hood||Long hood end (SD38, SD39, SD40);|
Long hood, engineer's side (SD45)
|Rear hood doors (SD45)||1-2-4-1 grouping (same as SD40, with added door)||1-2-2-2-1 grouping (rearmost door on right shortened for handbrake)|
|Truck brake cylinders||Low-mounted||3 low, 1 high||All high|
|Fans||Flat center cap||Open-top|
|MU receptacle housing||Short, wide, angled side||Tall, narrow, angled bottom|
|End plate||Small tabs at bottom steps, end plates do not extend below steps||Angled extensions at bottom steps, end plate extends to bottom of pilot||Straight edges (as on Dash-2 units)|
|Footboards||Flat plate on side extending behind pilot end plate (as on SD35)||Beveled plate on side flush with pilot end plate (as on Dash-2 units)|
|Fuel tank supports||Triangular brace||Pentagonal brace (rectangle with angled corner)|
|Electrical cabinet air filter box||No (unless subsequently added)||Yes|
|Short hood grabirons||Top-mounted, straight||Bottom-mounted, U-shaped (appeared on some units starting with Phase 1c)|
|Radiator intake subscreen||Diamond mesh||Square wire grid|
|Rear traction motor cables||Split and cross underframe||Similar routing to front|
|Dynamic brake roof vent||No (unless subsequently added)||Yes (additional side vent on SD45 only)|
|Blower duct||Flat||Two horizontal ribs|
|Front taper on dynamic brake housing||Short, angled||Longer, nearly straight|
|Handrail stanchions||bottoms not lined up||revised front corner handrails (SD38, SD39, SD40);|
bottoms lined up (inconsistent on SD45)
- The last orders of Phase 2b2 SD40's (PC 6240-6284) feature Phase 2c-style handrails.
- Depending on the thickness of the end plates (0.75" or 1.5") the overall length is either 65' 8" or 65' 9.5".
- Standard fan arrangement used tall radiator fans and a lower dynamic brake fan. Some units had lowered radiator fans, or a dynamic brake fan raised on a rim.
- Sanding nozzle routing varied, either under or through the brake beams.
Sarberenyi, R. EMD's SD45 and SDP45- Original Owners. Retrieved January 2017 from http://www.trainweb.org/jaydeet/sd45.htm
Unofficial EMD Homepage. (2004). SD40 Order Numbers. Retrieved April 2010 from http://www.trainweb.org/emdloco/sd40.htm
Unofficial EMD Homepage. (2006). SD45 Order Numbers. Retrieved April 2010 from http://www.trainweb.org/emdloco/sd45.htm