Which manucfaturer's type was 2-6-0?
CREATE TABLE "locomotives_of_the_great_western_railway" (
  "manufacturer" text,
  "type" text,
  "quantity" real,
  "m_swj_nos" text,
  "gwr_nos" text
);
SELECT "manufacturer" FROM "locomotives_of_the_great_western_railway" WHERE "type"='2-6-0';