CREATE TABLE table_42484 ("Milepost" FLOAT, "Name of the tunnel" CLOB, "Length" CLOB, "Maximum Height" CLOB, "Minimum Height" CLOB)

What is the Milepost of the Twin Tunnel #1 North?
SELECT COUNT("Milepost") FROM table_42484 WHERE "Name of the tunnel" = 'twin tunnel #1 north'
SELECT COUNT("Milepost") FROM "table_42484" WHERE "Name of the tunnel" = 'twin tunnel #1 north'