 The cost of the current construction stage amounts to €3.3 million and the entire renovation of the tunnel is currently estimated to cost about €10 million.At the beginning of November 2014, it was announced that the Rhein-Main-Verkehrsverbund and Alstom had agreed to use new railcars with fuel cell propulsion (iLINT) on the lines of the Taunus network (12, 13, 15 and 21) from 2018 at the earliest.In the case of the Taunus Railway, the possible electrification would not be affected.