CREATE TABLE train (train_id DECIMAL, train_num TEXT, name TEXT, from TEXT, arrival TEXT, railway_id DECIMAL)
CREATE TABLE manager (manager_id DECIMAL, name TEXT, country TEXT, working_year_starts TEXT, age DECIMAL, level DECIMAL)
CREATE TABLE railway_manage (railway_id DECIMAL, manager_id DECIMAL, from_year TEXT)
CREATE TABLE railway (railway_id DECIMAL, railway TEXT, builder TEXT, built TEXT, wheels TEXT, location TEXT, objectnumber TEXT)

Show the builder of railways associated with the trains named 'Andaman Exp'.
SELECT T1.builder FROM railway AS T1 JOIN train AS T2 ON T1.railway_id = T2.railway_id WHERE T2.name = "Andaman Exp"
SELECT "T1"."builder" FROM "railway" AS "T1" JOIN "train" AS "T2" ON "Andaman Exp" = "T2"."name" AND "T1"."railway_id" = "T2"."railway_id"