1980's er somoy Kolkata metro 1st metro in India and ota underground o chilo. Sei somoy underground metro rail er Construction experience company khub dorkar chilo r sei somoy technology ato advanced o chilona tai onek constraint o chilo. Tokhon technology ato advanced chilona aaj 2020 r moton...tokhon kono PPP model er concept er o tamon acholon chilona ...r kono private companies eta te agroho o dekhaini.....IR only option chilo karon IR through Central government with state government money spend korte parto r sei somoy kar technology use kora hoyechilo Kolkata metro NS a. But hatsoff to IR, State and Central governments at that time made this possible. Aaj k 40 yrs baad dariye theke sei somoykar this technology Construction er upor comment kora jaina....technology frequently update hoi new technology ase ....r old technolocal faults gulo theke sikhei technology update kora hoy new technology te....ami mone kori NS route...
more... tar jonnoi Kolkata metro aaj o government royeche na hole ei privatization er yug a eta loss a bole kobei Central government private kore dito..... Apni jei contraint ta bolchen otai ei Kolkata metro rokkha kabaj. But Jani na koto din
Ar NS route er theke Delhi metro ridership onek times besi tai NS er theke besi busy metro line India kothao nei eta thik noi....