That seems to be pretty good info, but much of it was compiled by Dr. Richard Hendrickson, PhD, who passed away several years ago. He was well known as a careful, thorough researcher who always adhered to high standards (in addition to being an all-around great guy). I suspect some of his excellent information may have been superseded by later product releases and the new discoveries of additional information.
According to Railway Prototype Cyclopedia (RP CYC) No. 1, Santa Fe had 500 AAR offset side steel twin hoppers, delivered in two different groups.
Class GA-54 consisted of 200 cars, numbers 180800-180999, built by GATC in March, 1941, with 2191 cu. ft. capacity. These were the AAR Alternate Standard design, and had Ajax brake gear and Wine door locks. A photo of 180874 appears in RP CYC 13, published in 2006. The Alternate Standard design is offered only by Intermountain. It is different from the Standard design in the contour of the “darts” in the corner of the car, and the spacing of the vertical support posts, the tops of which are visible just below the bulb angle. The visible portion of the vertical support is also covered by a shroud on the Alternate Standard car.
Class GA-72 consisted of 300 cars, numbers 78000-78299, built by Pullman Standard in 1948, with 2145 cu. ft. capacity. These were the AAR Standard design, and had Ajax brake gear, Keystone door locks, and Gypsum brake step. A photo of 78114 appears in RP CYC no. 25, published 2012; and a photo of 78130 appears in RP CYC 13, published in 2006. The AAR Standard design is offered by Athearn, Atlas, Kadee, and Accurail. These models show some differences, including differences in the end bracing. Most or all are correct for some prototype(s), but I don’tknow which is closest for Santa Fe. Photos should answer that question for you. In comparison with the Alternate Standard, the AAR Standard design has a different contour in the corner “darts” and its vertical posts are not equal
The ATSF was not a big coal road, so didn’t have many “coal trains” per se. The only reason they would haul coal is if there was a coal fired power plant or an industry that used coal. Most of the coal in the 1940’s and 1950’s would have been hauled in Caswell gons, a version of the GS gon, instead of hoppers.
Santa Fe had some coal mines in Colorado and New Mexico, and the road burned coal in many steamers on its Eastern lines. I suspect (not sure) most of that coal came from online mines, or sources in Illinois and adjacent States. Certainly, hoppers were a small part of the ATSF fleet, and gondolas carried a lot of coal on ATSF.