Question: Name the 2 car sets for 622 
SQL: SELECT "2-car sets" FROM "1-19255192-2" WHERE "Total vehicles" = 622.0;

Question: Name the most 3 car sets
SQL: SELECT MAX("3-car sets") FROM "1-19255192-2";

Question: Name the 4 car sets for 6 car sets being 44
SQL: SELECT MIN("4-car sets") FROM "1-19255192-2" WHERE "6-car sets" = 44.0;

Question: Name the least 4 car sets
SQL: SELECT MIN("4-car sets") FROM "1-19255192-2";