Can you tell me the Class (old) to 1868 that has the Quantity larger than 8?
CREATE TABLE "early_broad_gauge_locomotives_for_all_tr" (
  "class_old_to_1868" text,
  "railway_number_s" text,
  "quantity" real,
  "year_s_of_manufacture" text,
  "type" text
);
SELECT "class_old_to_1868" FROM "early_broad_gauge_locomotives_for_all_tr" WHERE "quantity">8;