Mr. Franzosa. I never thought there was a horn facing rearward anywhere on the C-425's because I never saw one in any picture that I can recall. When Mr. Jim(NHJJ4) said there was one on the fireman's side of the cab, I started looking through them again. The view of NH 2558 on the railpictures link is of the front of the fireman's side of the cab. The picture on page 46 of New Haven Diesel Locomotves Volume 1 was taken around noon because the shadows are near vertical. Almost directly above the fireman's side rear cab window of #2551 there is a small roundish shadow surrounded by a circle with a slight shadow beneath it. There is another object casting another shadow below the circular one. With a magnifying glass, the shadow looks not quite a true circle, with a little offset in the lower right quadrant, similar to the shadow of the trumpets of the two air horns above the cab of #2555. The shadow shape being surrounded by a circle with a small shadow beneath it resembled in my mind's view a more frontal view of #2555's horns. I'm accounting for angle shift and distance from the lens for part of my interpretation, plus the length is harder to determine since the rear locomotive (2551) is more of a frontal view than the front locomotive (2555). The air horn's trumpet has got to be so short that there is no evidence of it at all on former #2555 (PC #2455) in the 1974 picture at the Cedar Hill engine facility on page 455 of New Haven Power 1838 - 1968. It is not a striaght side shot, and PC might have removed them by that date for some reason. I went through the index of articles in Shoreliner and pulled out the two about the C-425's. Shoreliner, vol 12, iss 3, in Mr. Rolly Osmun's article titled "Modeling the New Haven's AlcoC-425s" the picture on page 25 clearly shows one air horn with a small diameter power chamber (can't see the back to see if it is flat or round) with a trumpet about half the length of the short trumpet on the front of the locomotive on C-425 #2559. The short air horn is above the fireman's side rear cab window and is easy to see because the bottom of the trumpet is in shadow making it stand out. The sad thing is, I looked at that picture to help with the power chamber shape and size, and should have seen the rear facing air horn because it is clear when you are looking for one around that location. So, Mr. Jim(NHJJ4) is correct by photo evidence for C-425 #2551 and #2559. Whether the other eight also had them is probable, but I haven't found other photo evidence to categorically say so.
Richard H. Sullivan, Jr. member #3967