CREATE TABLE table_12461 ("year" TEXT, "opus" TEXT, "town" TEXT, "kind" TEXT, "manuals" TEXT, "stops" TEXT)

What town has 15 stops and a NB kind?
SELECT "town" FROM table_12461 WHERE "stops" = '15' AND "kind" = 'nb'
SELECT "town" FROM "table_12461" WHERE "kind" = 'nb' AND "stops" = '15'