CREATE TABLE table_5855 ("Designation" TEXT, "Car numbers" TEXT, "Manufacturer" TEXT, "Model No." TEXT, "First used" TEXT, "Quantity" FLOAT)

Which Car numbers have a First used of currently on order?
SELECT "Car numbers" FROM table_5855 WHERE "First used" = 'currently on order'
SELECT "Car numbers" FROM "table_5855" WHERE "First used" = 'currently on order'