BKC as first station of Bullet train is very important decision with very long term implications which otherwisw may have seriously affected the patronage as well as viability of the whole project. BKC is a locality which matches the high end project. Other option (near LTT) could have been a dampener for the ADI bound travellers to opt for HST instead of airlines.
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Obstacles are gradually and continually being removed and HST project appears to be moving ahead firmly if not very fastly.