West Bengal's Hooghly district and strengthened its manufacturing capacity in the automobile segment. The 1954 Morris Oxford series II in India was licence-built at Uttarpara, (Hooghly district), West Bengal, three years after its debut in England and labelled as the 1957 Hindustan Landmaster. Engaged in the manufacture of the Ambassador, Contessa and utility vehicles like the Trekker, Porter and Pushpak, the plant hardly introduced any innovations or improvements. Hindustan Motors was the only manufacturing facility in the world to manufacture parts for the obsolete Bedford trucks. Sale of Ambassador taxis has been outlawed since 1 April 2011, a year after BS IV emission standards were rolled out in 11 Indian cities, including Kolkata. In later years, Hindustan Motors fitted the cars with a cleaner diesel engine in order to comply with new emission rules, allowing it to resume taxi service in Kolkata, one of the cities in which the vehicle had been banned. Models and versions Mark I (1957 to 1962) In 1957, Hindustan Motors, to further earlier collaboration with Morris Motors, who by then had become British Motor Corporation after merger with Austin Motors, entered into an agreement to manufacture 1956 Morris Oxford series III in India. All the tooling was transferred to Uttarpara plant in India. The car was rebadged as Ambassador (later called Mark 1) was launched in mid-1957 and the early model Morris Oxford series II derived Hindustan Landmaster was discontinued. The new model included deep headlamp cowls and small rear wing "tail fins". The dashboard and steering wheel were completely redesigned. The Landmaster's flat-plane two-spoke steering wheel gave way to a dished steering wheel with three spokes made-up of four wires per spoke, for the Ambassador. Also a new, dimpled bonnet made its debut. These models had an Austin Motors derived 1476 cc side-valve petrol engine. In 1959 the side-valve engine was replaced by a 1489 cc, 55 bhp overhead-valve BMC B-series petrol engine. Mark II (1962 to 1975) In January 1962, the Ambassador underwent a frontal facelift with a closely chequered grille more reminiscent of the Morris Mini. The interior had a redesigned dashboard and instrument cluster. The early models have sun mica sheet but it was replaced by wood grain coated plywood and aluminium bezel in later models (1968 onwards). This model was named as Ambassador Mark II, and the early version quickly got dubbed as Mark I in the market, while it