Second World War and aftermath
Regular passenger car production ceased in 1939 and after World War II, the company produced trucks only, with buses added to the range later. However, more than 20 brand-new sedans were in the factory when the Germans requisitioned it in June 1940, and these were immediately put into service. After the liberation, from late 1944 to early 1945, about 50 sedans were assembled from parts on hand, and in 1946, the last 15 sedans were completed by the Geneva agents. The company was given back to the family in 1949, but to Marius Berliet's son Paul following the founder's death earlier that year. The Berliet GLR truck became the first new post-war product.
In his 1975 book, Vichy France: old guard and new order: 1940-1944, Robert Paxton contrasted the fate of the Berliet truck factory in Lyon, which remained in Marius Berliet's family possession, despite his having manufactured 2,330 trucks for the Germans. — and the fate of Louis Renault's factories, which had also been seized — suggesting that the Renault factory might have been returned to Louis Renault and his family, had he lived longer. Marius Berliet, who died in 1949, had however "stubbornly refused to recognize legal actions against him after the war."[11] As it happened, Renault's were the only factories permanently seized by the French government.[11]
After a small start with diesel engines in 1931, Berliet (and their customers) gradually abandoned petrol engines. In 1963, only 234 of the 15,325 Berliet vehicles built still received petrol engines.[12]
Berliet manufactured the largest truck in the world[13] in 1957, the T100 6X6 with either 600 PS and 700 PS from a Cummins V12 engine. Available as a 6WD Dumptruck or 6X6 Roadtractor for Europe and North Africa it was designed in 10 months at the factory in Courbevoie, outside of Paris, with a second example built in 1958 and two further T100s built in 1959.
Later on a separate company called MOL Trucks of Hooglede, Belgium, bought the design rights of some original Berliet models of the 1970s and started to manufacture their own original MOL model range consisting of medium to large 4X4, 6X6 and 8X8 lorries and roadtractors. Their design and engineering was entirely based on selected former Berliet units.