Locomotives Phases - GE B23-7, B30-7, B30-7A, B36-7

These phases are of my own making.

Phases

Phase 1a

• Left sideframe access hatches: 5
• Truck centers: 36' 2" (equal distance from front and rear pilots)
• Jacking pads: plain
• Hinged panels under radiator wings: 3 bolts, straight bottom edge
• Exhaust: small stack, no silencer, narrow base
• Rear numberboards: flush
• Rear classification lights: high
• Cab side windows: 4
• Overall length: 62' 2"
• Left-side hatches under cab: 2 narrow - 3 wide, small latches

Phase 1b

• Left sideframe access hatches: 2

Phase 2a

• Truck centers: 37' 2" (rear truck moved rearward 1')

Phase 2b

• Jacking pads: flat metal plate on underside
• Hinged panels under radiator wings: central latch, notched bottom edge

Phase 2c

• Exhaust: large stack/silencer, wide base
• Rear numberboards: raised
• Rear classification lights: low
• Cab side windows: 2 (late Phase 2c)

Phase 3

• Overall length: 61' 2"
• Truck centers: 36' 8" (rear truck 4" closer to pilot than front)
• Left-side hatches under cab: 1 wide - 1 narrow - 3 wide, large latches

Model variations

• BQ23-7 units are Phase 1b.
• B30-7A, B30-7A1 and B30-7AB units are all Phase 3.
• B36-7 units are Phase 3, except for SSW 7770-7773, which are Phase 2c.

Other details

• Doors under forward section of radiator may or may not have 3 narrow vertical intakes. Some units had such intakes retrofitted.
• Most Phase 2c units have a short exhaust silencer (as on concurrent 6-axle units); Phase 3 and some Phase 2c units have a taller exhaust silencer.