Locomotives Phases - EMD SD70M-2, SD70ACe

These phases are of my own making.

Phases

Phase 1a

• Jacking pads: open
• Panel above dynamic brake intake: 2 tall doors, 3 rows of vertical louvers
• Cab sub-base panels: hinged
• Inverter cabinet grills: surface-mounted
• Frame side sill: open under cab
• Rear grabirons: right side of hood end
• Rearmost door under left radiator intakes: bolted
• Air reservoirs: strap supports
• Dynamic brake intake: open at bottom corners
• Rear hood end bottom panels: 2 latches
• Left side handrail: straight (SD70ACe) or zig-zag (SD70M-2) vertical section behind inverter cabinet
• Left underframe cable shroud
• Side sill handrail stanchion supports: vertical
• Panel behind inverter cabinet: solid (SD70ACe) or square grill intake (SD70M-2)
• Panel ahead of right-side central air intake: 2 bolted panels

Phase 1b

• Jacking pads: flat metal plate covering (SD70ACe) or open (SD70M-2)
• Panel above dynamic brake intake: 2 tall doors, 3 columns of horizontal louvers
• Cab sub-base panels: bolted
• Inverter cabinet grills: flush

Phase 2a

• Panel above dynamic brake intake: 2 short doors, 3 short columns of horizontal louvers
• Frame side sill: continuous, version 1 (marginally narrower under cab)
• Rear grabirons: left side of hood end
• Air reservoirs: end support brackets
• Dynamic brake intake: notched bottom corners

Phase 2b1

• Panel above dynamic brake intake: 2 medium doors, 3 medium columns of horizontal louvers
• 6th right-side handrail stanchion from rear moved forward
• Rear headlight moved upward
• Rear hood end bottom panels: 1 latch

Phase 2b2

• No left underframe cable shroud

Phase 2c

• Frame side still: continuous, version 2 (marginally narrower under cab and front hood section)
• Left side handrail: zig-zag vertical section behind inverter cabinets, stanchions moved rearward
• Side sill handrail stanchion supports: angled sides

Phase 2d1

• Panel behind inverter cabinet: small (SD70ACe) or large (SD70M-2) louvered section
• Revised right-side front air piping
• Revised fuel cutoff switch housing

Phase 2d2

• Panel above dynamic brake intake: 2 medium doors, 3 short columns of horizontal louvers
• Panel ahead of right-side central air intake: 1 bolted panel, 8 bolts

Phase 2e

• Jacking pads: curved metal plate covering
• No traction motor cable shroud under inverter cabinet housing (SD70M-2)

Phase 2f

• Panel behind inverter cabinet: rectangular grilled intake, same as central air intake (SD70ACe)
• Panel ahead of right-side central air intake: 1 larger bolted panel, 10 bolts
• Isolated cab seam: notch around right-side rear cab door latch

Model Variations

• SD70ACe units exist in all phases.
• All SD70M-2 units are Phase 2a, 2e or 2f. EMDX SD70M-2 demonstrators are early Phase 2a units with some Phase 1 spotting features (air reservoir straps and no notches in dynamic brake intake).
• As a DC unit, the SD70M-2 does not have inverters but retains the inverter cabinet housing found on the SD70ACe.

Other details

• Trucks (HTSC or HTCR-4) vary across all phases, and sometimes vary within a single order.
• Rear sand fills are either on top of the hood or in notches on the hood ends.