As people celebrate and Twitter trends on #BulletTrain, I find the idea very good, but wonder how useful will this new idea be? I am not getting into the financial aspects of the proposed 508 km-long Mumbai to Ahmedabad High Speed Rail (MAHSR) project. Going by available data, the project cost is estimated to be Rs 1.1 lakh crore, for which the Indian government will be borrowing Rs 88,000 crore from Japan at an interest of 0.1 per cent per annum. Importantly, the loan will be repaid in 50 years with a 15 year grace period.