Fritz' picture posted by Greg fits very nicely with the map posted by Steve. And in looking at my pix of trains climbing Cumbres, there are a lot of blocks of flatcars loaded with freshly cut lumber that are either at the rear or headend of the train, often next to Gramps tanks, which leads me to believe they may have originated at Chama. One train with a bunch of flats loaded with lumber on the rear is from August 29, 1967. From the pix I have Weidman loaded a lot of boxcars with lumber, not sure if they also loaded flats. The mill near Juanita seems to have loaded flats.
JBWX