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Last updated 2009-05-31
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Trainiax > Drawings > Locomotive Phases > EMD GP38, GP40
Trainiax > Info > Locomotive Phases > EMD GP38, GP40
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Locomotive Phases - EMD GP38, GP40

The following phases were compiled from existing sources of GP38 and GP40 phases.
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- Phases -

Phase 1a - 1965.11 - 1966.04
-Battery box cover under cab: Flat
-Short hood grabirons: Top-mounted, straight
-End plate: Version 1 (Small tabs at bottom steps)
-Fans: Flat center cap
-ECAFB: No
-Radiator intake subscreen: Diamond mesh
-Blower duct: Flat
-Dynamic brake housing taper: Short, angled
-Handrail stanchions: Uneven spacing (closer at rear), bottoms not lined up

Phase 1b - 1966.04 - 1967.09
-Battery box cover under cab: Ribbed

Phase 2a1 - 1967.07 - 1967.10
-End plate: Version 2 (Angled sides at bottom steps)
-Fans: Open-top

Phase 2a2 - 1967.09 - 1968.02
-ECAFB: Yes

Phase 2a3 - 1968.02 - 1968.06
-Short hood grabirons: Bottom-mount, drop

Phase 2b - 1968.06 - 1971.04
-Radiator intake subscreen: Square wire grid

Phase 2c - 1971.04 - 1971.12
-Blower duct: Ribbed
-Dynamic brake housing taper: Long, less tapered
-Handrail stanchions: Even 48" spacing, bottoms lined up

Phase 3 - 1971.12
-End plate: Version 3 (Straight edges, no extension at bottom steps)

Notes
-ECAFB: Electrical cabinet air filter box (behind cab, left side)
-Some Phase 2a1 units had combinations of early or late end plates and fans.
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- Other details -

-Taller step spacing introduced with Version 2 pilot end plate; narrow spacing was retained on some subsequent units.
-Standard fan arrangement incorporated high radiator fans and a low dynamic brake fan.  Some units had low radiator fans, or a dynamic brake fan raised on a rim.
-Multiple fuel tank sizes available: 1700, 2600, 3000, 3200 and 3600-gallon capacities.
-Sanding nozzle routing varied, either under or through brake beams.
-ECAFB was retrofitted to many earlier units.

-In Trainiax side-view drawings, Phase 2c and Phase 3 are combined.
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- From late GP38 and GP40 to early GP38-2 and GP40-2 -

-Bolted (rather than hinged) front battery boxes
-Oblong water-level sight glass (right rear of hood)
-Optional M-type Blomberg trucks
-Modified central air intake and blower duct
-Modified rear hood doors (2-2-2-1 grouping instead of 1-2-4 grouping)
-Lengthened walkway blower duct
-Addition of bolted, rectangular cab side panel
-Stanchions reverted to uneven spacing (closer at rear) similar to early GP38 and GP40
-Larger ECAFB
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Michael Eby 2009