The new TRAVERSO of the Südostbahn, a StadlerRail 8 car "Flirt 3", RABe 526 # 102/202, is on a test run on the Gotthard mountain line in the Biaschina. In the background you can see the middle and the upper level of this "staircase" with two spiral tunnels to gain/loose hight. The TRAVERSO will regularly run on this line from december 2020, in cooperation of the Südostbahn and the SBB.