CREATE TABLE "locomotives_of_the_great_western_railway" (
  "manufacturer" text,
  "type" text,
  "quantity" real,
  "lmmr_name" text,
  "gwr_no" real
);

Question: Which Manufacturer has a Quantity of 1, and has the LMMR name Great Mountain?
SQL: SELECT "manufacturer" FROM "locomotives_of_the_great_western_railway" WHERE "quantity"=1 AND "lmmr_name"='great mountain';