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
);

Question: What is the quantity preserved when 4 were made of class F-21?
SQL: SELECT "quantity_preserved" FROM "class_f_2_8_0" WHERE "quantity_made"='4' AND "class"='f-21';

Question: What fleet number had 3 made?
SQL: SELECT "fleet_number_s" FROM "class_f_2_8_0" WHERE "quantity_made"='3';

Question: What class had 1 made and fleet number of 406?
SQL: SELECT "class" FROM "class_f_2_8_0" WHERE "quantity_made"='1' AND "fleet_number_s"='406';

Question: What class has 0 preserved and 2 made?
SQL: SELECT "class" FROM "class_f_2_8_0" WHERE "quantity_preserved"='0' AND "quantity_made"='2';