Buenos Aires Pacific 4-6-4 Locomotives in Argentina

Class 2351 (Locobase 20303)

Data from "Heavy Tank Engine, Buenos Ayres and Pacific Railway, Argentine Great Western Line", Locomotive Magazine, Volume 20 (15 December 1914), p. 307.

Thoroughly British in conception, this class's design was prepared by F C York, the railway's locomotive superintendent, to the specification prepared by London-based consulting engineering firm Messrs. Fox & Mayo. Concession to the Argentine operating environment including adapting to the 9 1/2" (241 mm) wider gauge, the fitting of large headlamps at both ends of the locomotive, and constructing a ventilated cab.

The profile certainly betrayed the engines' origin in featuring inside valves, plate frame, a straight running board, capped stack. and Belpaire firebox. Although relatively small, the locomotive's cylinder volume and smaller drivers generated considerable tractive effort at the cost of an easily overmatched boiler.

Class unknown (Locobase 2857)

Data from Jonathan D H Smith, "BA&P/FCN San Martin steam locomotives" in Standard Steam Engines at [], last accessed 28 September 2023. Works numbers were 4022-4033 in 1930.

These large and handsome suburban tank engines were supplied by Robert Stephenson & Company. Compared to the North British Hudson tanks supplied to the BA&P in 1914 (Locobase

Painted an attractive green, they were tall with Belpaire boilers holding a relatively small grate and low heating surface to cylinder volume ratio. The latter resulted from the use of three simple-expansion cylinders that conferred good acceleration from the departure of many suburban stations.