City's First Subway Tunnel in 40 Years Cut Through
MTA Chmn Ronan cuts through steel bulkhead separating rock tunnel under Welfare Is from 750âft steel tube under East River; predicts trains will run through doubleâdecked tunnel by â79 or â80; $70âmillion tunnel, the cost of which will be shared almost equally by NYC and NYS, will provide connections to new and existing subway lines in Queens from Manhattan's E Side and from IND and BMT lines on W Side; illus; map