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
Tunjukkan ID dan pembangun kereta api yang terkait dengan paling banyak kereta.
CREATE TABLE train (Railway_ID VARCHAR); CREATE TABLE railway (Builder VARCHAR, Railway_ID VARCHAR)