kolkata railway minister ashwini vaishnaw on wednesday took a trolley ride through eastwest metros hooghly river tunnels to indias deepest metro station coming up inside howrah railway stationthe minister started his inspection at howrah maidan station accompanied by metro general manager p uday kumar reddy and senior officials from metro railway and kmrc travelling onward to howrah metro station and then underriver to the kolkata side asked about the 25km trouble section at bowbazar due to which eastwest metros extension to howrah maidan is not currently possible vaishnaw said the metro gm is in touch with bowbazar residents i will request him to set up a camp to make the people understand the issues he will make whatever alternative arrangements have to be made and address the safety issues relating to the underground constructionbefore vaishnaw surveyed the underriver stretch with the help of 3d models and diagrams reddy briefed him about the tunnel ventilation system tunnel lighting power supply and the overall train operation system the ministers trip through the 520m river tunnels was something the engineers were eagerly waiting for the minister called it an engineering marvel the corridor linking kolkata and howrah will carry 67 lakh passengers daily