Mogiana Beyer-Garratt Locomotives in Brazil

Class 156 (Locobase 569)

Data from Lionel Wiener (1930); and A[rthur] E[dward] Durrant, Garratt Locomotives of the World (revised edition) (Newton Abbott, UK: David & Charles, 1981), p 85. Works numbers were 5529-5530 in 1912.

This pair rolled on a Double Ten-wheeler Garratt arrangement that Beyer-Peacock never repeated. They burned wood fuel in a deep Belpaire firebox. They operated on a 250-km (155 mile line with 3% gradients; rated at 175 tons with max speed of 25 mph (41 kph).

Weiner noted that having the main rod drive off the second coupled axle, rather than the usual third, shortened the connecting rod length. They ran until 1950.

NB: Tube length is an estimate based on the calculation of tube surface area by subtracting reported firebox heating surface from reported total evaporative heating surface.

Class 189 (Locobase 570)

Data from "Recent 'Garratt' Patent Locomotives", Railway Engineer, Volume 43, No. 5 (May 1922), pp. 184-186; and "Mogyana Railway-Design 0695", Beyer-Garrrat Patent Articulated Locomotives (Manchester, England: Beyer-Peacock & Company Limited, 1931), archived on flickr's Historical Railway Images at [], et seq, p. 22. Design No. 0695, p. 22. Works numbers were 5787-5789 in 1914.

Superheated versions of the 1912 Ten-wheeler Garratts shown in Locobase 569. Those latter engines were the first built for the metre gauge and this trio were among the first fitted with superheaters. Most of the principal elements of a Beyer-Garratt formula showed here: Belpaire firebox, outside constant-lead radial valve gear, superheater, short and thick boiler, and low axle loadings. Like the 1912 engines, these burned wood fuel in a deep Belpaire firebox.

The RE noted that 38 lb/yard (19 kg/metre) rail was a limitation. The engines pulled 175 ton (159 metric ton) trains at up to 25 mph (40 km/h) and hauled passenger trains at 18.5 mph (30 km/h) up 2% grades.

B-P's 1931 survey preferred to see them as somewhat primitive prototypes: "It must ...be borne in mind that many years have passed ...and the modern Beyer-Garratt ...has very little in common as regards detail of construction."

Despite their dated ingredients, all remained in service until 1950.