The Metre-gauge Buenos Aires Midland Railway bought two of these locomotives in October 1931. The BAMR had been using Sentinel-Cammell railcars for suburban traffic, but increasing numbers of passengers meant that multiple units were required. The locomotive shown here was based on the Sentinel twin-engined railcar chassis, of which large numbers were made, and used by some British railway companies such as the LNER. (this site has so far not looked at railcars- something possibly for the future
The locomotives resulted from a specification drawn up by Liversey, Son, & Henderson, a firm of consulting engineers. Sentinel built the locomotive chassis while Metropolitan-Cammell built the coaches and the locomotive bodywork. Each train was made up of one locomotive, one first-class carriage, and two second-class carriages.

Above: One of the Argentinian Steam-Motor locomotives. Not a good picture, but probably the only one in existence.

Each locomotive was fitted with twin six-cylinder engines giving 250 hp maximum. A Woolnough water-tube boiler working at 300 psi was mounted more or less in the middle of the chassis. The boiler was fed by a Weir feedpump, with its delivery routed through an exhaust-steam feed heater. 24V electric power was provided by a J Stones turbine generator, feeding gauge and cab lights as well as a 14-inch Tonum headlight at each end of the locomotive.

These two locomotives were followed by The Colombian Steam-Motor Locomotive, about which there is far more information.

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