CREATE TABLE table_204_637 (id NUMBER, "type" CLOB, "gauge" CLOB, "railway" CLOB, "works no." CLOB, "year" CLOB, "builder" CLOB)

which railway was the only railway that hunslet taylor bulit a garratt for ?
SELECT "railway" FROM table_204_637 WHERE "builder" = 'hunslet-taylor'
SELECT "railway" FROM "table_204_637" WHERE "builder" = 'hunslet-taylor'