Question: What is Quantity made, when Wheel Arrangement is "2-6-0", and when Class is "D-3"?
SQL: SELECT "Quantity made" FROM "2-17248696-4" WHERE "Wheel arrangement" = '2-6-0' AND "Class" = 'D-3';

Question: What is Fleet Number(s), when Wheel Arrangement is "2-6-0", and when Class is "Z"?
SQL: SELECT "Fleet number(s)" FROM "2-17248696-4" WHERE "Wheel arrangement" = '2-6-0' AND "Class" = 'Z';

Question: What is Fleet Number(s), when Quantity Preserved is "0", when Quantity Made is 1, and when Class is "Z"?
SQL: SELECT "Fleet number(s)" FROM "2-17248696-4" WHERE "Quantity preserved" = '0' AND "Quantity made" = '1' AND "Class" = 'Z';