@noelekal ,
I once read that Hamilton paid a survey outfit to canvass active railroaders to see what brand of railroad standard watch they were carrying. IIRC, the survey results indicated that 58 % of active railroaders were carrying Hamilton railroad standard watches. The other 42% were carrying railroad standard watches from other makers who made such watches. We might well ask if the results of the survey were skewed by someone, to yield favourable answers. Elgin probably produced 5 or six times the number of watches than Hamilton did, but Hamilton specialized in railroad watches, calling themselves “The Watch of Railroad Accuracy” in their ads, for decades. You could possibly build a collection of 2 dozen or so railroad grade and railroad standard Hamiltons, and have no duplicates! Could you with any one of the other U S makers? I don’t know. You mentioned the names of 8 watch manufacturers. The big 4 were Hamilton, Waltham, Elgin, and Illinois. But the other four makers were in the business as well, and produced railroad standard watches. Why are you concerned with who were the “major” manufacturers. Is it because you want to focus only on the majors? I would call the first 4 you mentioned, the “majors”. You can acquire a collection by the “rifle” method, or the “shotgun” method. A narrow focus, or a broad focus. Has perusing the offerings in this thread helped at all in giving you a focus? My collection of railroad standard watches comprises mainly the “big 4”. But I also have Keystone Howards which I quite like. And I have two Brandt (Omega) 19-jewel grade CCRS. I just like railroad watches, period.