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This western railroad was famous for its canyons. Name the canyon: 1.  where the railroad was laid as narrow-gauge on a standard-gauge grade built by another railroad 2.  where the railroad was laid as narrow-gauge on a standard-gauge grade built by the same railroad 3.  where Amtrak made a swan dive 4.  with the tightest curve on this railroad's transcontinental main line 5.  with the most tunnels 6.  with the fewest tunnels, and the highest bridge 7.  which should have been bridged on a big steel viaduct and bypassed entirely, but the railroad couldn't afford the steel 8. named for the Roman goddess of drought and starvation (appropriate!) 9. which was dammed by nature 10.  it's the little version of this more famous one 11.  the tunnels are twinned S. Hadid
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