Description

Volume 2, Number 4 — M. Keith Williams, Editor
(Published Q4‑2003 • 36 pages)

This issue presents an in‑depth technical and historical exploration of the Rio Grande’s 3‑cylinder M‑75 “Mountains,” along with a detailed study of the narrow‑gauge 4000‑series boxcars. Volume 2, Number 4 blends mechanical engineering history, locomotive development, freight‑car evolution, and preservation‑era photography to close out the 2003 publication year with a strong focus on motive power and rolling stock.

Featured Articles

• 3‑Cylinder Locomotives and the Denver & Rio Grande Western M‑75s — Robert B. Schaefer
  A comprehensive examination of 3‑cylinder steam locomotive development in the United States, leading to the Rio Grande’s unique M‑75 class 4‑8‑2s. Schaefer traces the origins of 3‑cylinder technology, Alco’s and Baldwin’s competing designs, the engineering challenges of valve gear and balancing, and the D&RGW’s requirements for high‑power mountain passenger service. Includes historical photography, mechanical diagrams, and detailed analysis of the M‑75’s performance and operational history.
• The Rio Grande’s Narrow Gauge 4000‑Series Boxcars — Jim Eager
  A detailed history of the D&RGW’s 4000‑series narrow‑gauge boxcars, including their construction, rebuild programs, service roles, and eventual conversion to 3000‑series standards. Eager documents structural changes, roof and door upgrades, and the operational context that shaped these cars’ long service lives. Features rare photographs from Chama, Silverton, and the Colorado Railroad Museum.
• Corrections & Additions — Editorial Staff
  Updates, clarifications, and supplemental notes to previously published Prospector articles, ensuring historical accuracy and continuity across the Society’s archival research.