calcutta state transport corporation charter cstc bus ac & non ac air conditioned service special & ordinary service key statistics application of information technology number of visitors cstc at a glance history calcutta state transport corporation cstc was constituted in terms of the notification no. 3929 wt dated 10 june 1960 of home transport department of the government of west bengal under the road transport corporation act 1950 lxiv of 1950 . the establishment of cstc came into effect from 15 june 1960 and it was entrusted with the development of road transport in the areas comprising calcutta and the districts of 24 parganas howrah and hooghly . the journey actually began on 31 july 1948 under the transport directorate when the state government decided to operate directly state buses both in the city and in some parts of the state to connect them with the city . with a modest strength of 25 petrol driven single decker buses the state transport services started operating in 6 city routes . the first garage at hastings on strand road was set up for the operation . new depots came up after formal constitution of cstc at belghoria 1950 lake 1951 howrah 1956 and so on . read more ... . welcome to calcutta state transport corporation 033 22361916 ; 033 22360462 033 22360463 ; 033 22371212 4 lines select service type air conditioned ac executive non ac special non ac ordinary enter date dd mm yyyy ac ac 1 ac 10 ac 12 ac 12d ac 14 ac 15 ac 17 ac 17b ac 20 ac 23a ac 24 ac 25 ac 37a ac 37b ac 39 ac 4 ac 41 ac 43 ac 44 ac 47 ac 48 ac 49 ac 49a ac 4a ac 5 ac 50 ac 51 ac 52 ac 53 ac 54 ac 6 ac 9 ac 9a ac 9b executive e 1 e 32 e 4 special s 10 s 10a s 11 s 12 s 12c s 12d s 12e s 13 s 14 s 14c s 15g s 16 s 17a s 19 s 2 s 21 s 22 s 22a s 23a s 24 s 24n s 2a s 2b s 30 s 31 s 32 s 37a s 39a s 3a s 3b s 3w s 4 s 42 s 44 s 45 s 46 s 47 s 47a s 48 s 48a s 4b s 4c s 4d s 5 s 51 s 53 s 5c s 7 s 9 s 91b s 9a s 9c ordinary 11 11a 12n 14a 15 19a 19b 19s 3 33 3a 2 5n 6n 7 75a 7a m 14 m 7c m 7d m 7e midi 1 welcome to calcutta state transport corporation places of interest in kolkata copyright to cstc 2014 .