It is 1,186 metres (3,891 ft) in length, and carries metre gauge (1,000 mm or 3 ft 3+3⁄8 in) track electrified at 11 kV AC 16 2/3 Hz using overhead catenary.
The tunnel runs under the Lopper, a shoulder of Mount Pilatus which extends into Lake Lucerne.
The nearby Lopper II Tunnel is a rail tunnel on the Zentralbahn Luzern–Stans–Engelberg line, the two rail lines joining at Hergiswil station.
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