The RBDe 560 046 leads the commuter train into the Lower Hauenstein tunnel. The construction of the summit tunnel in 1853 by the Schweizerische Centralbahn (SCB) was a big challenge, because never before had a mountain range been penetrated in Switzerland. Nobody thought it possible that the tunnel could be driven from both sides and meet in the middle after years of work. The English contractor Thomas Brassey decided to drive the tunnel from five points. Both ends and from three perpendicular shafts from the surface of the mountain to the axis of the tunnel, a way unsurpassed till today. Even the new Gotthard tunnel is built 2011 the same way.
