“Engineers have drilled through the last remaining rock to create the world's longest tunnel, under the Swiss Alps,” reports the BBC about the Gotthard Base Tunnel in “Swiss Create World's Longest Tunnel.” “The 35-mile (57 km) Gotthard Base Tunnel is an extraordinary engineering achievement: over 12 years, 2,600 workers battled dust, noise and heat beneath up to 1.5 miles of mountain to remove 23 million tons of rock — the equivalent of moving five Grand Pyramids of Cheops. When the $12 billion project is completed in 2017, a high-speed rail link will run through the mountain base, slashing journey times across the Alps by an hour,” reports Time in “Switzerland Celebrates World's Longest Rail Tunnel.” More details can be found on the AlpTransit site.
Where is engineering of railroad tunnels under mountains classed? A class-elsewhere note at 625 Engineering of railroads and roads reads: “Class tunnel engineering in 624.193.” The entry 624.193 Tunnels is a subdivision of 624.19 Underground construction. At 624.193 Tunnels is the see reference: “For mountain tunnels, see 624.192.” Hence engineering of mountain tunnels—for railroads, roads, or other purposes—is classed in 624.192 Mountain tunnels. An example is a work about construction of the Vereina Tunnel on the Rhaetian Railway’s Vereina line, Vereinalinie RhB: [Klosters-Lavin, 1991-1999], classed in 624.1920949473 Mountain tunnel in Graubünden (Grisons), Switzerland (built with 624.192 plus T1—09 Geographic treatment plus T2—49473 Graubünden (Grisons), following instructions at T1—093–T1—099 Treatment by specific continents, countries, localities; extraterrestrial worlds).
The interdisciplinary number for tunnels, 388.13 Special road features, has the see reference: “For railroad tunnels, see 385.312.” A subdivision of 385 Railroad transportation, 385.312 The way has the including note: “Including bridges, grade crossings, tracks, tunnels.” An example of a work classed in 385.312 is The Spiral Tunnels and the Big Hill on the Canadian Pacific Railway. The tunnels are located in the Canadian Rockies in T2—71168 Columbia-Shuswap Regional District; however, because the topic of tunnels is in an including note and thus in standing room—it does not approximate the whole of 385.312—no further addition is possible.
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