Locomotives Phases - GE U23C, U30C, U33C, U36C

These phases are based on the U30C roster compiled by David Thompson.  I have adopted these phases in the 1:36 drawings after using slightly different phases in the 1:55 drawings.  I have observed some additional detail differences, which I have added in existing phases as well as in a new phase called 2g3.

Phases

Phase 1a

(Late U28B carbody)

• Radiator intakes: single, long
• Exhaust stack: tall
• Radiators/rear hood: wider than hood, raised walkway over flush radiators
• Brake chain pipe: square
• Left-side equipment doors: 8
  
• Footboards
• Speed recorder cables: every axle
• Handrail notch in stepwell: short
• Door latches: double circular
• Headlight casing: rectangular
• Cab side drip rail

Phase 1b

• Radiator intakes: shorter, two smaller intakes added

Phase 1c

• Exhaust stack: short
  

Phase 2a

• Radiator intakes: flush/flat
• Brake chain pipe: circular
• Radiators/rear hood: hood widened to match radiators, flush walkway
• Added horizontal drip rail on radiators
• Added taper ahead of radiators

Phase 2b

• No taper ahead of radiators
• Left-side equipment doors: 6
• Uneven handrail stanchion spacing

Phase 2c

• Radiator intakes: raised/corrugated

Phase 2d

• No horizontal drip rail on radiators

Phase 2e

• Handrail notch in stepwell: full-length

Phase 2f1

• Speed recorder cables: on 1 or 2 axles only
• sometimes present on Phase 2e
• No footboards

Phase 2f2

• Door latches: single square

Phase 2g1

• Door latches: double circular
  
• Headlight casing: oblong
• No cab side drip rail

Phase 2g2

• Door latches: single square

Phase 2g3

• Door latches: double circular
• Shorter, wider right-side battery boxes

Phase 2h1

• Door latches: single square
• Battery box covers moved rearward
  
• Right-side handrail stanchion spacing changed
• Added cab door stiffener

Phase 2h2

• Headlight casing: separate
  
• Hinged numberboards

Other Details

Units rode on at least 5 types of FB-3 trucks:

• GSC, low-mounted brake cylinders
• Early Adirondack, low-mounted brake cylinders
• Late Adirondack, low-mounted brake cylinders
• GSC, high-mounted brake cylinders
• Late Adirondack, high-mounted brake cylinders