What class had 1 made and fleet number of 406?
CREATE TABLE "class_f_2_8_0" (
  "class" text,
  "wheel_arrangement" text,
  "fleet_number_s" text,
  "manufacturer" text,
  "year_made" text,
  "quantity_made" text,
  "quantity_preserved" text
);
SELECT "class" FROM "class_f_2_8_0" WHERE "quantity_made"='1' AND "fleet_number_s"='406';