Table schema:
CREATE TABLE table_name_68 (builder VARCHAR, order_year VARCHAR, fuel_propulsion VARCHAR, model VARCHAR)

Question: Which builder has a Fuel Propulsion of diesel, a Model of d40lf, and an Order Year of 2005?
SQL: SELECT builder FROM table_name_68 WHERE fuel_propulsion = "diesel" AND model = "d40lf" AND order_year = "2005"