CREATE TABLE "northern_ireland" (
  "nir_number" text,
  "introduced" text,
  "br_number_s" text,
  "built" text,
  "type" text
);

Question: Which NIR number is for the tso (ex-br class 488 unit 488305) type that has a 6082 / 72605 BR number?
SQL: SELECT "nir_number" FROM "northern_ireland" WHERE "type"='tso (ex-br class 488 unit 488305)' AND "br_number_s"='6082 / 72605';