CREATE TABLE "1874_82" (
  "1st_built" real,
  "1913_class" text,
  "w_a" text,
  "no_built" real,
  "builder" text,
  "date" text,
  "lner_class" text
);

Question: What is the 1913 class of locomotive that has a 1st built value under 494 and WA of 4-4-0t?
SQL: SELECT "1913_class" FROM "1874_82" WHERE "1st_built"<494 AND "w_a"='4-4-0t';