World ' s wealthiest doctor dies on a train . Dr M A Ansari , reputed to be the world ' s wealthiest doctor , has died in a train between Mussoorie and Delhi , India , at the age of 56 . Dr Ansari was an ex President of the Indian National Congress and intimate colleague of Mr Gandhi . He was personal physician to Indian princes worth millions of pounds . Photo shows , Dr M A Ansari . 11 May 1936 *** Local Caption ***