class demonstrated that large and powerful steam locomotives could run in general use on light rails of with low speed limits. Their maximum axle load had been reduced to 10 tons, all were fitted with double Kylchap exhaust systems and their leading and trailing trucks had Athermos axle boxes. Three tender types could be coupled to them, one heavy and two light, for work in different areas. The heavy tender had six-wheel bogies, a coal capacity of 12 tons and a water capacity of . The light coal tender had four-wheel bogies, a coal capacity of 7 tons and a water capacity of . The light wood tender had four-wheel bogies, a firewood capacity of and a water capacity of . These modern locomotives were regarded with suspicion by some enginemen who were used to obsolete British locomotives which were often over forty years old. In addition, diesel locomotive salesmen claimed that steam traction was obsolete. This attitude spread to middle management staff, with the result that these modern French steam locomotives were replaced in the 1960s, when they were hardly run in. Some of those locomotives which worked in Southern Brazil were leased to the Bolivian Railways in the 1960s. By 2004, some still existed as wrecks in a locomotive dump near Santa Cruz in Bolivia. Bulgaria As part of their modernising and standardisation program, the Bulgarian State Railways (BDZ) ordered twenty superheated three-cylinder (1’D2’-h3) locomotives from Krupp in 1941. The industrial disruption of the Second World War, however, overloaded the German locomotive builders with domestic production demands and Krupp was only able to produce ten of these new BDZ Class 36 tank locomotives in 1943, works numbers 2272 to 2281. The new 109.9 ton Class 36 locomotives were intended to replace the older 2-8-0 (1D-h2) locomotives on local passenger train services. The axle loading was kept below 16 tons and their large coal and water capacities made the new class suitable for a wider range of duties, if required. Small smoke deflectors were fitted to the top of the smokebox. When the new locomotives arrived in Bulgaria in 1943, they were allocated to Sofia depot. Between 1953 and 1957, five locomotives were relocated to Plovdiv depot to serve the Plovdiv-Svilengrad line. In addition to the local passenger train service, duties there also included international express trains to and from Turkey. In 1961, the remaining five locomotives were relocated