CREATE TABLE "4_8_4" (
  "class" text,
  "wheel_arrangement" text,
  "fleet_number_s" text,
  "manufacturer" text,
  "serial_numbers" text,
  "year_made" text,
  "quantity_made" text,
  "quantity_preserved" text,
  "year_s_retired" text
);

Question: What are the serial numbers for the locomotives of Class 4-8-4 — oooooooo — northern?
SQL: SELECT "serial_numbers" FROM "4_8_4" WHERE "class"='4-8-4 — oooooooo — northern';

Question: What is the fleet number for the model with Serial number 68056?
SQL: SELECT "fleet_number_s" FROM "4_8_4" WHERE "serial_numbers"='68056';

Question: What is the serial number of the model made in 1930?
SQL: SELECT "serial_numbers" FROM "4_8_4" WHERE "year_made"='1930';

Question: What is the wheel arrangement for the model that was retired in 1955?
SQL: SELECT "wheel_arrangement" FROM "4_8_4" WHERE "year_s_retired"='1955';