Question: What is the Model of the Engine with 29 Seats Built in 1941–1942?
SQL: SELECT "Model" FROM "2-1838472-6" WHERE "Seats" = 29.0 AND "Built" = '1941–1942';

Question: What is the Quantity of the engine Model PG-2901?
SQL: SELECT "Quantity" FROM "2-1838472-6" WHERE "Model" = 'PG-2901';