Questions on Postwar Diesel Horns

I am looking into buying a 623 A.T.&.S.F. or Chesapeake & Ohio 624 Switcher.

Do these diesels have horns in them?

If not, what Diesels, besides F3’s have horns in them. I would like to buy a diesel with a horn to complement my 2055 Hudson.

steel rails

No horns in the 623 and 624. The Trainmasters, Alcos, and GP7s have horns, although some model numbers may not. For details, check
http://www.postwarlionel.com/diesel.html

Some postwar NW2’s had operating horns:
601 Seaboard (1956)
602 Seaboard (1957-58)
616 Santa Fe (1961-62)
617 Santa Fe (1963)
621 Jersey Central (1956-57)