CREATE TABLE table_204_336 (id NUMBER, "operators" CLOB, "named trains" CLOB, "destination" CLOB, "year begun" CLOB, "year discontinued" NUMBER)

what was the first train to begin service ?
SELECT "named trains" FROM table_204_336 ORDER BY "year begun" LIMIT 1
SELECT "named trains" FROM "table_204_336" ORDER BY "year begun" FETCH FIRST 1 ROWS ONLY