for type diesel-mechanical and configuration b-b, what is the status?
CREATE TABLE "locomotive_collection" (
  "name" text,
  "livery" text,
  "arrival" real,
  "type" text,
  "configuration" text,
  "builder" text,
  "built" real,
  "status" text,
  "location" text
);
SELECT "status" FROM "locomotive_collection" WHERE "configuration"='b-b' AND "type"='diesel-mechanical';