Swiss President Doris Leuthard will officially open the 52 million-Swiss franc ($52.6 million) project running from Schywz to the mountain village of Stoos, which lies 1,300 metres (4,300 ft) above sea level in central Switzerland.
The barrel-shaped carriages adjust their floors so passengers can still stand upright even as they climb towards the Alpine plateau at inclines of up to 110 percent.
"After 14 years of planning and building, everyone is very proud of this train," said Ivan Steiner, spokesman for the railway.
(Reporting by John Revill; editing by Andrew Roche)
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