Rio Grande do Sul 2-8-2 Locomotives in Brazil

Class 21 (Locobase 21127)

Data from Alco class 282 S 164 Order C-640 builder's card supplied in February 2023 by Teemu Koivumaki..Works number was 62506 in November 1920.

Immediately following the four Pacifics delivered to the RGS in 1920, Alco's remaining Paterson, NJ subsidiary added this even bigger and more powerful Mikado. Despite the larger boiler, the grate still burned wood from a tender that carried four cords.

Perhaps the lone engine was too big. The 20 Mikados ordered from Montreal in the next years suggest as much; see Locobase 13460..

Class 501 (Locobase 13460)

Data from "Equipment and Structures -- Locomotives", Railway Review, Volume 68 (12 February 1921), p. 268; and Class 282S 105 Order No Q-303 builder's card supplied by Teemu Koivumaki in February 2023.. Works numbers numbers were 62991-63010 in May 1921.

Class 631 (Locobase 15269)

Data from Baldwin Locomotive Works Specification for Engines as digitized by the DeGolyer Library of Southern Methodist University, Vol 72, pp. 123+. Works numbers were 58156-58159 in December 1924.

Although the lion's share of Mikado orders from this southeast Brazilian road had gone to Alco's Montreal Works in 1921 (Locobase 13460), Baldwin managed to sell four more that packed more heating surface and power into very nearly the same size locomotive. In addition to grate with half again as much area (which led to a less sizable increase in firebox area), the 1924 engines also included 31 sq ft (2.9 sq m) in the combustion chamber and 15 sq ft (1.4 sq m) in arch tubes.

NB: see Locobase 13987 for an overview of the RG do Sul as described by Lionel Wiener in 1912.