CREATE TABLE table_name_31 (quantity_made VARCHAR2, wheel_arrangement VARCHAR2, class VARCHAR2)

What is Quantity made, when Wheel Arrangement is '2-6-0', and when Class is 'D-3'?
SELECT quantity_made FROM table_name_31 WHERE wheel_arrangement = "2-6-0" AND class = "d-3"
SELECT "quantity_made" FROM "table_name_31" WHERE "2-6-0" = "wheel_arrangement" AND "class" = "d-3"