Locomotives Phases - EMD SD70, SD70M

Phases

These phases are of my own making.

Phase 1a1

• Flat rectangular panel between side frame and fuel tank
  
• Steps: 4
• Trucks: HTCR, version 1
• Access panels, short hood bottom corners: rectangular
• Fuel cutoff switch: in sideframe
• Radiator intakes: flat
• Panel under right radiator intake: large
• Front engine compartment: 2 doors, flush
• Panel above dynamic brake intake: 10 bolts, 2 panels
• Panels under central air intake (2 left, 1 right): 16 bolts
• Long hood end: rounded hood and light housing corners
• Engine compartment: rounded top edge
• Door under right central air intake: small hinges, single handle
• Dynamic brake intake: grid, close spacing
• Short hood: version 1 (rounded edges, tapered, no forward slope)
• Rear grabirons: bottom-mount
• Jacking pads: metal plate covering
• Left-side handrail stanchions behind fuel tank: 5

Phase 1a2

• No panel between side frame and fuel tank
• Revised underframe cable/pipe routing
  

Phase 1b

• Steps: 5

Phase 1c1 - 2000.04 - 2000.11

• Trucks: HTCR, version 2

Phase 1c2 - 2000.10 - 2001.10

• Access panels, short hood bottom corners: notched
• Fuel cutoff switch: large housing under sideframe

Phase 2a - 2000.11 - 2001.01

• Radiator intakes: flared, version 1
• Panel under right radiator intake: small

Phase 2b1 - 2001.12

• Front engine compartment: 2 doors, raised
• Panel above dynamic brake intake: 8 bolts, 1 panel
• Panels under central air intake (2 left, 1 right): 8 bolts
• Long hood end: square hood top and light housing corners, rounded hood side corners
• Engine compartment: square top edge
• Door under right central air intake: standard hinges, dual latches

Phase 2b2 - 2001.12 - 2002.02

• Fuel cutoff switch: small housing under sideframe

Phase 2c1 - 2002.01

• Dynamic brake intake: vertical rods, wide spacing
• Fuel cutoff switch: large housing under sideframe

Phase 2c2 - 2002.01 - 2002.08

• Fuel cutoff switch: small housing under sideframe

Phase 2d1 - 2001.12 - 2002.11

• Front engine compartment: 3 doors, raised
• Central air and radiator intakes: fewer bolts

Phase 2d2 - 2002.03

• Short hood: version 2 (square edges, not tapered, side panel forward slant)

Phase 2d3 - 2002.03 - 2002.11

• Short hood: version 2
• Long hood end: square hood side corners
• Rear grabirons: top-mount

Phase 2d4 - 2003.01 - 2003.04

• Short hood: version 1

Phase 2e1 - 2003.04 - 2004.06

• Short hood: version 1
• Radiator intakes: flared, version 2

Phase 2e2 - 2003.04 - 2003.06

• Short hood: version 2
• Left-side handrail stanchions behind fuel tank: 4

Phase 2e3 - 2004.09 - 2004.12

• Jacking pads: open

Notes

• Standard-cab SD70 units are Phase 1a1 to 1b only.
• Most phases are detail variations of UP units, since they account for the majority of SD70M production.
  

Other details

• UP units Phase 1c2 and later have underframe light under right side cab.
• UP units Phase 2b1 and later lack access panels on engine compartment roof.
• Partway through Phase 2d1 production, UP units no longer have right rear speed recorder cable.
• Larger brackets for radial-steering linkages on HTCR trucks appeared partway through Phase 2d1 production.