These three are real photo postcards; that is, one-off postcards made by Kodak from negatives sent in by camera owners.  The photo of the N&W hopper and the two crew cars can be dated to between 1904 and 1918, as can the shot of the steam locomotive.  The one of the crane resetting a CC&O derailment is from the 1918-1930 period.  There is no other identifying information on any of these cards.  I think they’re fascinating and I snapped them up as soon as I saw them.