There were at least five rail logging operations on the Tierra Amarilla Grant, but Buckman Lumber Co is a new name for me... It sounds more like the location of Biggs Junction (MP 343.57) where the D&RG and Biggs Lumber Co collaborated to build the Tierra Amarilla Southern RR south of Chama to the Rio Brazos... After the D&RG took complete control of this rail operation they changed the Junction name to Brazos Junction... Shortly afterwards the D&RG tore up the TAS RR... But like any heavily logged region the wide range of name changes, track relocations and the like are often missing pieces to a larger jigsaw puzzel... Cordially... John