Double-decker bus
The first commercial horse-drawn double-decker omnibuses were introduced in England in 1847 by Adams & Co. of Fairfield, Bow, then improved upon by John Greenwood, who introduced a new double-decker in 1852.
Double-decker bus
Kerala State Road Transport Corporation is operating double deckers in Thiruvananthapuram and Kochi cities. Kolkata and also has double-decker buses. They are modelled on the London buses. Ashok Leyland Titan double decker buses are used in all cities. Articulated double-decker buses from Ashok Leyland were used till they were phased out in the early 1990s as they were thought to be unsuitable for city traffic. Recently in Kolkata, CSTC reintroduced double decker bus with music system on selected routes where wide road space was available, i.e. no over-head cables, low bridges or flyovers. CSTC has spent 1 million INR to renovate 1 bus. Today, double deckers exist only in Mumbai, Vadodara, Kolkata, Kochi and Thiruvananthapuram.