KOLKATA, Mar 14: On a day of dramatic developments, TMC tonight sought the removal of its seniormost nominee in the Union Cabinet Railway Minister Dinesh Trivedi hours after he proposed a hike in railway passenger fares, plunging the UPA Government in an unusual political crisis.Angered by Trivedi’s proposal contained in the Railway Budget which he presented to Parliament earlier in the day, mercurial TMC boss and West Bengal Chief Minister Mamata Banerjee wrote to Prime Minister Dr Manmohan Singh late in the night seeking removal of Trivedi and his replacement by Mukul Roy, currently Minister of State for Shipping who had earlier served in the Railway Ministry.”Yes, I have written to the Prime Minister seeking his replacement with Mukul Roy, another Union Minister,” Banerjee told reporters