CREATE TABLE railway (Builder VARCHAR(255), Railway_ID VARCHAR(255)); CREATE TABLE train (Railway_ID VARCHAR(255), Name VARCHAR(255))
Show the builder of railways associated with the trains named "Andaman Exp".
    
SQL: SELECT T1.Builder FROM railway AS T1 JOIN train AS T2 ON T1.Railway_ID = T2.Railway_ID WHERE T2.Name = "Andaman Exp"