Thanks Charles for posting the Clemmons Climax. The pipe from the stack was a cinder catcher. This allowed cinders to accumulate in the pipe until thay could be dumped in a safe place in order to avoid setting the forest on fire. As you noted these cinder catchers were common on the C&S, where they were correctly named Ridgway Stacks and called by railfans as "Beartrap" stacks. The cinder catchers were also found on many log railroads such as the 3' gauge Bridal Veil Lumbering at Palmer, OR. Attached are views of their "Jumbo" Baldwin 0-6-0T and "Peggy" 0-6-0+T new Palmer, OR on Jan. 19, 1910, both had double cinder pipes.