Rapido is offering USRA double sheathed Box cars, ATSF Bx-2 in HO scale. Rapido is offering both a 4-pack for US$199.80 or single cars for $49.95, minimum order of two cars. For more information from Rapido, go to: https://rapidotrains.com/products/ho-scale/freight-cars/ho-scale-usra-double-sheathed-wood-boxcar
According to the Santa Fe Live list, they had 2687 of these in 1922. In 1938 they still had 2442 but in 1942 only had 253. None were listed in 1945. This information varies from information in the Boxcar book.
The Boxcar book says the Santa Fe had 2700, numbered 37001-39700, class BX-2. K brakes, vertical staff hand brake, Andrews trucks. Until 1932, the car numbers carried a C. T. suffix, a Columbia Trust designation. Virtually all (2635 of 2700) were rebuilt into steel sheathed cars with new steel sides and roof, retaining the underframe and original ends. The rebuilding began in 1937 and was completed in 1942, encompassing the BX-28, 31, 32, 33, and 36 class.
Thanks to Steve Sandifer for the information. Photo courtesy of Rapido website.