Question: What manufacturer made 6 and preserved 1?
SQL: SELECT "Manufacturer" FROM "2-17248696-2" WHERE "Quantity made" = '6' AND "Quantity preserved" = '1';

Question: How many did Alco -Schenectady preserve of class B-3?
SQL: SELECT "Quantity preserved" FROM "2-17248696-2" WHERE "Manufacturer" = 'Alco -Schenectady' AND "Class" = 'B-3';

Question: What manufacturer made class B-2?
SQL: SELECT "Manufacturer" FROM "2-17248696-2" WHERE "Class" = 'B-2';