Question: What is the smallest 8-car sets if 4-car sets is 47?
SQL: SELECT MIN("8-car sets") FROM "1-19255192-1" WHERE "4-car sets" = 47.0;

Question: What is the largest 6-car-sets for fiscal year 1968?
SQL: SELECT MAX("6-car sets") FROM "1-19255192-1" WHERE "Fiscal year" = 1968.0;

Question: What is the lowest fiscal year if total vehicles is 490?
SQL: SELECT MIN("Fiscal year") FROM "1-19255192-1" WHERE "Total vehicles" = 490.0;