CREATE TABLE table_5850 ("Designation" TEXT, "Car numbers" TEXT, "Manufacturer" TEXT, "Model No." TEXT, "First used" TEXT, "Quantity" FLOAT)

Which First used has a Quantity of 26?
SELECT "First used" FROM table_5850 WHERE "Quantity" = '26'
SELECT "First used" FROM "table_5850" WHERE "Quantity" = '26'