Locomotives Phases - EMD GP40-2

For the changes that occurred from the GP40 to the GP40-2, see GP38-GP40 phases.

GP40-2 Phases

These phases are partly of my own making and partly based on SD40-2 phases by Scott Chatfield.  The GP40-2 underwent a similar evolution to the SD40-2.

Phase 1: 1972.01 - 1975.05

• Battery box covers: Bolted, small louvers
• Cab sub-base doors: Hinged
• ECAFB: Separated from cab
• Electrical cabinet air filter box, located on the left behind the cab
• Steps: Version 1
• Radiator intakes: Square wire grid
• Short hood: 81" length
• Cab side panel: Bolted, 11 bolts along top/bottom
• Pilot/ends: Straight upper end plate corners, no raised coupler cut lever, no front anticlimber
• Rear upper pilot/drop step area: Version 1, inward-facing handrail stanchion supports
• Radiator fans: Flat top
• Exhaust: Raised stack
• Blower duct: Flat, wide, two ribs, no raised walkway
• Frame side sill: Narrow over air reservoirs, wide at ends

Phase 2a: 1976.01 - 1978.12

• Battery box covers: Bolted, large louvers
• Cab sub-base doors: Lift-off tabs
• ECAFB: Flush with cab
• Steps: Version 2
• Radiator intakes: Corrugated
• Short hood: 88" length, vent on right side
• Cab side panel: Bolted, 13 bolts along top/bottom
• Pilot/ends: Notched upper end plate corners, raised coupler cut lever, front anticlimber (2 versions, depending on railroad)
• Rear upper pilot/drop step area: Version 2, outward-facing handrail stanchion supports

Phase 2b: 1979.01 - 1979.11

• Cab side panel: Welded

Phase 2c: 1979.12 - 1981.03

• Battery box covers: Horizontal rib added (some railroads)
• Radiator fans: Q-type
• Exhaust: Raised silencer, opening at rear

Phase 2d: 1981.05 - 1982.07

• Short hood: Bolted hatch added on top

Phase 3: 1983.03 - 1986.12

• Battery box covers: Latched, lift-off tabs
• Blower duct: Angled, narrow, no ribs, raised walkway ("laundry chute")
• Exhaust: Raised silencer, opening at front
• Frame side sill: Narrow over entire length

Model variations

• All GP40-2(W) and GP40-2L(W) units are Phase 1.

Other details

• Various as-built pilot options: standard footboards (up to 1975), plow (various sizes), sloped (2 types), flat end plate
• Two variations in step spacing, depending on railroad
• Oblong cab vent appears on most units (generally on left side, towards rear) starting with Phase 2a