Question: Name the trailers for formed from PAN/PUL/RES cars
SQL: SELECT "Trailers" FROM "2-1214638-4" WHERE "Formed from" = 'PAN/PUL/RES cars';

Question: Name the typed for formed from 6-PUL Trailer Third in RES unit
SQL: SELECT "Type" FROM "2-1214638-4" WHERE "Formed from" = '6-PUL Trailer Third in RES unit';

Question: Name the formed that has type of 4-COR
SQL: SELECT "Formed from" FROM "2-1214638-4" WHERE "Type" = '4-COR';