Unnao, Feb 03 (ANI): 11-year-old Nayan Sinha from Unnao has written a letter to Prime Minister Narendra Modi, narrating the difficulties he faces due to absence of a crossing at the railway tracks between his locality and school. This prompted PM Modi to ask the railways to intervene, following which the Northern Railways has written a letter to Sinha. He received a letter from the divisional engineer, of Northern Railways, mentioning his application sent to the Prime Minister some two days back.