Chennai/ Colombo, Nov 15 (ANI): As CHOGM summit starts in Colombo on Friday with all the major commonwealth countries including the Indian delegation headed by Foreign Minister Salman Khurshid attending it, demonstrators in Tamil Nadu blocked trains and staged protests against the same. Earlier, Tamil Nadu had put immense pressure on the government to boycott Commonwealth meet, following which Prime Minister Manmohan Singh cancelled his visit to Colombo.