CREATE TABLE table_8809 ("Class" TEXT, "Wheel arrangement" TEXT, "Fleet number ( s ) " TEXT, "Manufacturer" TEXT, "Year made" TEXT, "Quantity made" TEXT, "Quantity preserved" TEXT)

What manufacturer made class b-2?
SELECT "Manufacturer" FROM table_8809 WHERE "Class" = 'b-2'
SELECT "Manufacturer" FROM "table_8809" WHERE "Class" = 'b-2'