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
Show the id and builder of the railway that are associated with the most trains.
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
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 value
Show the id and builder of the railway that are associated with the most trains .