Locomotives Phases - GE U23B, U30B, U33B, U36B

These phases are based on the U30B 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 two new phases: 2b2 and 2b3.

Phases

Phase 1a

(Late U28B carbody)

• Radiator intakes: single, long
• Brake wheel: small
• Exhaust stack: tall
• Radiators/rear hood: wider than hood, raised walkway over flush radiators
• Brake chain pipe: square
• 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

• Brake wheel: large
• Exhaust stack: short (late Phase 1c)

Phase 2a

• Radiator intakes: flush/flat
• Brake chain pipe: circular
  • sometimes present on Phase 1b-1c
• Radiators/rear hood: hood widened to match radiators, flush walkway
• Added horizontal drip rail on radiators
• Added taper ahead of radiators

Phase 2b1

• No taper ahead of radiators

Phase 2b2

• Wider left-side equipment doors
• No box on left-side walkway behind cab

Phase 2b3

• Uneven handrail stanchion spacing

Phase 2c

• Radiator intakes: raised/corrugated

Phase 2d

• No horizontal drip rail on radiators

Phase 2e

• No footboards

Phase 2f1

• Speed recorder cables: on 1 or 2 axles only
  • sometimes present on Phase 2e
• Handrail notch in stepwell: full-length

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 2h1

• Shorter, wider right-side battery boxes
• Right-side handrail stanchion spacing changed
• Added cab door stiffener

Phase 2h2

• Headlight casing: separate
• Hinged numberboards