When the Narendra modi established the biggest electric railway

Dear student Please recheck your question as it seems to be incomplete or unclear. Is not clear your asking about the railway network or train itself. As there is no as such major development in the railway network or the longest train rather there is the India's fastest electric train launched by Modi government which was Vande Bharat Express. So Please be little more specific so that we can provide you with meaningful help. Keep posting Regards