CREATE TABLE table_name_15 (rr_nos VARCHAR2, builder VARCHAR2, year VARCHAR2)

Name the RR numbers of hudswell clarke and years before 1914
SELECT rr_nos FROM table_name_15 WHERE builder = "hudswell clarke" AND year < 1914
SELECT "rr_nos" FROM "table_name_15" WHERE "builder" = "hudswell clarke" AND "year" < 1914