New Delhi, Aug 26 - Three days after he snapped ties with the party over 'ideological differences', former Bharatiya Janata Party (BJP) strategist Sudheendra Kulkarni Wednesday said he had joined an advisory committee in the railway ministry headed by Trinamool Congress chief Mamata Banerjee.

Denying reports that he had joined the Trinamool Congress, Kulkarni said he had been appointed on a 'committee in the ministry of railways that has been constituted to advise the minister on how to innovatively usher in reforms in the railways'.

Kulkarni, who was aide to senior BJP leader L.K. Advani and also adviser to former prime minister Atal Bihari Vajpayee, categorically said: 'I am not joining any political party.'

The 58-year-old IIT graduate-journalist-political backroom boy was a Communist Party of India-Marxist card holder before he crossed over to the other side of the political spectrum.

'I have major ideological differences with the party.