Good question - which ones are missing fireboxes?
#1 is CLW. My first O Scale kit locomotive (other than A-N Diesels). From Bob Smith, 1979.
#2 -Saginaw G5 - a little rough; I am just its caretaker.
#3 - Hybrid - CLW boiler, lengthened, Saginaw frame, sprung. Scratch tender. Lobaugh drivers.
#4 - Saginaw
#5 - same as 3, but with a Walthers coach in tow.
#6 - Saginaw E6
All H10 Consolidations use the same boiler casting. The hybrid Atlantic is simply the H10 casting with a 1/4" spacer (Atlantic is longer than the Consol). The Saginaw G5 and E6 use different cab and boiler castings, and use sheet metal fireboxes.