on 12 July 2011. In 2012, he was the subject of a controversy regarding the Railway Budget. This happened after Mamata Banerjee expressed her discontent with the increase in passenger fares, and demanded the resignation of Dinesh Trivedi, Railway Minister. After Dinesh resigned, Mukul became the Railway Minister of India and he removed the fare hike introduced by the former Railway Minister Dinesh Trivedi, to much criticism. With the exit of Trinamool from UPA coalition due to an allowance of 51% FDI in retail and aviation sector, Mukul Roy's tenure of railway minister came to an end in the month of September 2012. Roy ran a special train called "DU Gyan Uday Express" a Bengali worded statement, which took 1000 students of Delhi University to places like Ahmedabad, Mumbai, Goa and Bangalore during the summer break of 2012. An application has been submitted to the Election Commission for the formation of the new political party called All India Trinamool Congress and Mukul aide Amitabha Majumdar has been named as the President. The head office of the party is located in Dinhata, in North Bengal. Roy and Mamata had a fall out in 2015 when his name came up in Saradha scam as well as in Narada sting operation in which TMC leaders are involved. Roy was suspended from the party for six years as he met senior BJP leaders like Finance Minister Arun Jaitley and BJP general secretary Kailash Vijayvargiya. He has resigned from Trinamool Congress on 25 September 2017. After that Roy also resigned from Rajya Sabha membership on 11 October 2017. Bharatiya Janata Party Roy formally joined the Bharatiya Janata Party on 3 November 2017. Upon joining the party, he said that he felt proud of working under Prime Minister Narendra Modi. He successfully contested the 2021 West Bengal Legislative Assembly election and won. "Rejoining" Trinamool Congress On 11 June 2021, Roy rejoined the All India Trinamool Congress along with his son Subhranshu Roy in the presence of Mamata Banerjee and others. On 25 June 2021, he was elected as a member of PAC by the speaker of West Bengal Legislative Assembly and later became the chairman of the PAC on 14 July 2021. Roy set foot in Krishnanagar, his constituency. He first came to Krishnanagar Bhatjangla on 27 June 2021. He was then greeted by All India Trinamool Congress activists wearing a wreath. Soon after, a quarrel