The party members staged the walk out soon after Congress MLA Manas Bhuniya's adjournment motion over the issue was denied by Speaker Biman Banerjee.
Later, Bhuniya told reporters that Railways ministry had already sanctioned the over-bridge project and funds, but the state government was not giving its approval.
Bhuniya also criticised the comments by Chief Minister Mamata Banerjee and Trinamool Congress All-India general secretary Mukul Roy on the interim railway budget presented in Parliament yesterday.
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