Locomotives Phases - GE C30-7, C30-7A, C36-7

These phases are of my own making.

Phases

Phase 1: 1979.06 - 1979.11

• Exhaust: small stack, no silencer, narrow base
• Rear numberboards: flush
• Rear classification lights: high
• Cab side windows: 4
• Left-side equipment doors: 2 narrow, 3 wide, small latches

Phase 2a: 1980.01 - 1980.07

• Exhaust: large stack/silencer, wide base
• Rear numberboards: raised
• Rear classification lights: low

Phase 2b: 1980.07 - 1981.01

• Cab side windows: 2

Phase 2c: 1981.03 - 1986.05

• Left-side equipment doors: 1 wide, 1 narrow, 3 wide, large latches

Model variations

• All C30-7A units are Phase 2c.
• All C36-7 units are either Phase 1 or Phase 2c.  Some later units featured modified radiator and dynamic brake intakes.  Other units are indistinguishable from the C30-7.

Other details

• Doors under forward section of radiator may or may not have 3 narrow vertical intakes. Some units had such intakes retrofitted.
• Units rode on 5 FB-3 truck types: Adirondack or GSC castings, with low- or high-mounted brake cylinders, and Adirondack castings with clasp brakes (NW versions).
• Some export Phase 2a through 2c units lack exhaust silencer, but have the larger stack base.
• Conrail units have 3-step end platforms in place of standard 4 steps.