What number corresponds to the quantity of 24?
CREATE TABLE "locomotives_of_the_early_period_for_all_" (
  "class" text,
  "number_s" text,
  "quantity" text,
  "year_s_of_manufacture" text,
  "type" text
);
SELECT "number_s" FROM "locomotives_of_the_early_period_for_all_" WHERE "quantity"='24';