The Finance Ministry has released an estimate finding that a planned extension of the Hokkaido Shinkansen line to Sapporo could fall to a level that would make it unprofitable. The ministry underlined the need to carefully examine the profitability and set appropriate leasing fees for railroads and other infrastructure charged to the operator of the shinkansen line. At a subcommittee meeting on Thursday of the Fiscal System Council, which advises the finance minister, the ministry presented the profitability estimate for the section between Shin-Hakodate-Hokuto Station and Sapporo Station based on a projection that project costs would increase by some ¥1.2 trillion due to prolonged tunnel construction and other factors. Meanwhile, rising prices, which are one of the reasons for the increase in the project's costs, may also push profitability upward through an increase in fare and real estate income.…