CREATE TABLE table_35862 ("Gauge" TEXT, "Railway" TEXT, "Works no." TEXT, "Year" TEXT, "Builder" TEXT)

In what Year is the Gauge 2 ft 6 in?
SELECT "Year" FROM table_35862 WHERE "Gauge" = '2 ft 6 in'
SELECT "Year" FROM "table_35862" WHERE "Gauge" = '2 ft 6 in'