Starting as the Projet Tres Petite Voiture in 1934, Pierre-Jules Boulanger CEO of Citroen described the need for a minimalistic car, cheap to produce and easy to run and maintain. The TPV evolved to become like a car until it formed into the 2CV we know for the 1948 launch. The first cars were given the designation 'Citroen A', but became 'Citroen AZ' from 1954; usually known as 'Citroën 2CV' from its taxation rating of 'deux chevaux-vapeur' From 1951 the AZU Fourgonette (Van) version was offered, and from 1958 a 4-wheel drive 'Sahara' model utilising engines in the front and rear of the 2CV. The next A-class Citroen used the underpinnings of the 2CV in a wilder upmarket car launched in 1960 as the Ami 6, and later Ami 8 but with a new 602cc engine. The 2CV spawned the squarer Citroen Dyane from 1967, originally conceived as the new A-class Citroen and a replacement for the 2CV, but in the end the rounder car saw it off. A 602cc engine from the Ami 6 was available in the 2CV6 from 1970. The 2CV had a 4-light shell until 1965 when most versions were given an extra window in the c-pillar. 3.8million 2CV cars plus 1.2million 2CV trucks were made from 1948-90. The real successor to the 2CV in the A-class was the Peugeot-based Citroen LN and LNA and later Citroen Visa, followed by the Citroen AX although none of these vehicles had the unique qualities of the 2CV