Table: train_inventory
Columns: fiscal_year
2_car_sets
3_car_sets
4_car_sets
6_car_sets
8_car_sets
total_vehicles

Question: Name the 2 car sets for 622 
SQL: SELECT "2_car_sets" FROM train_inventory WHERE "total_vehicles" = 622

Question: Name the most 3 car sets
SQL: SELECT MAX("3_car_sets") FROM train_inventory

Question: Name the 4 car sets for 6 car sets being 44
SQL: SELECT MIN("4_car_sets") FROM train_inventory WHERE "6_car_sets" = 44

Question: Name the least 4 car sets
SQL: SELECT MIN("4_car_sets") FROM train_inventory