Question: What is the minimum Height of the Little Switzerland Tunnel?
SQL: SELECT "Minimum Height" FROM "2-16177885-1" WHERE "Name of the tunnel" = 'Little Switzerland Tunnel';

Question: What is the Milepost of the twin tunnel #1 north?
SQL: SELECT COUNT("Milepost") FROM "2-16177885-1" WHERE "Name of the tunnel" = 'twin tunnel #1 north';