Table: ireland_coaching_stock
Columns: nir_number
introduced
br_number_s
built
type

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 ireland_coaching_stock WHERE "type" = 'tso (ex-br class 488 unit 488305)' AND "br_number_s" = '6082 / 72605'