text: Below is an context that describes a sql query, paired with an question that provides further information. Write an answer that appropriately completes the request.  # noqa: E501
  ### Context:
  CREATE TABLE train (Railway_ID VARCHAR); CREATE TABLE railway (Builder VARCHAR, Railway_ID VARCHAR)
  ### Question:
  Show the id and builder of the railway that are associated with the most trains.
  ### Answer:
  SELECT T2.Railway_ID, T1.Builder FROM railway AS T1 JOIN train AS T2 ON T1.Railway_ID = T2.Railway_ID GROUP BY T2.Railway_ID ORDER BY COUNT(*) DESC LIMIT 1