| 1980 |
Elected to 7th Lok Sabha |
| 1981 |
Member, Secretariat, Communist Party of India (Marxist) [C.P.I.(M)], Distt. Committee, Purulia;Member, State Committee, C.P.I.(M), West Bengal |
| 1984 |
Re-elected to 8th Lok Sabha (2nd term) |
| 1985 onwards |
Member, State Committee, C.P.I.(M), West Bengal |
| 1985-89 |
Member, Railway Convention Committee |
| 1986-89 |
Member, Joint Select Committee on Railways Bill |
| 1989 |
Re-elected to 9th Lok Sabha (3rd term) |
| 1990-91 |
Chairman, Committee on Public Undertakings ;Member, House Committee |
|
;Member, General Purposes Committee;Member, Consultative Committee, Ministry of Industry;Member, Committee of Privileges;Member, General Purposes Committee;Member, Committee to review the rate of dividend payable by the Railway Undertakings to General Revenues ;Member, Consultative Committee, Ministry of Industry ;Special Invitee, Consultative Committee, Ministry of Railways;Member, General Purposes Committee;Member, Committee on Installation of Portraits/Statues of National Leaders and Parliamentarian in Parliament House;Member, Consultative Committee, Ministry of Heavy Industry & Public Enterprises;Special Member, Consultative Committee, Ministry of Power;Special Member, Consultative Committee, Ministry of Power |
| 1990-96 |
Member, Consultative Committee, Ministry of Railways |
| 1991 |
Re-elected to 10th Lok Sabha (4th term) |
| 1993-95 |
Member, Committee on Public Undertakings |
| 1993-96 |
Chairman, Committee on Government Assurances;Member, Committee on Railways |
| 1996 |
Re-elected to 11th Lok Sabha (5th term) |
| 1996-97 |
Chairman, Committee on Railways;Member, Panel of Chairman |
| 1998 |
Re-elected to 12th Lok Sabha (6th term) ;Member, Panel of Chairman, Lok Sabha |
| 1998-99 |
Convenor, Sub-Committee on Power, Committee on Energy;Member, Committee on Energy and its Sub-Committees on Coal and Action Taken Reports |
| 1999 |
Re-elected to 13th Lok Sabha (7th term) |
| 1999-2004 |
Chairman, Committee on Petitions ;Member, Committee on Energy |
| 2000-2004 |
Member, Consultative Committee Ministry of Railways
Special Member, Consultative Committee, Ministry of Industry |
| 2004 |
Re-elected to 14th Lok Sabha( 8th term)
Leader, CPI (M) Parliamentary Party, Lok Sabha
Chairman, Committee on Railways
Member, Rules Committee
Member, General Purposes Committee;Member, Committee on Security in Parliament Complex |
| 5 Aug. 2007 |
Chairman, Committee on Railways |
| 2008 |
Member, Central Committee CPI (M) |
| 2009 |
Re-elected to 15th Lok Sabha (9th term);Leader, CPI (M) Parliamentary Party, Lok Sabha |
| Jun. 2009 |
Member, Panel of Chairmen, Lok Sabha |
| 29 Jun. 2009 |
Member, Business Advisory Committee |
| 31 Aug. 2009 |
Chairman, Committee on Agriculture |
| 19 Oct. 2009 |
Member, General Purposes Committee;Member, Consultative Committee, Ministry of Heavy Industries & Public Enterprises |