Below is the list of tables from the database along with their columns and datatype. Need to generate an accurate SQL query for the question.
Only use the columns present in the respective table. Only use the columns which are required to generate the SQL query. Only use table joins if required and not otherwise.

### Tables ###
TABLE: CREATE TABLE table_204_336 ( id number, "operators" text, "named trains" text, "destination" text, "year begun" text, "year discontinued" number )

### Question ###
what was the first train to begin service ?

### Accurate SQL ###

SELECT "named trains" FROM table_204_336 ORDER BY "year begun" LIMIT 1