CREATE TABLE table_59671 ("Class" TEXT, "Quantity" FLOAT, "Type" TEXT, "Delivered" TEXT, "K.B.Sts.B. Class" TEXT, "Retired" TEXT)

What is the type of the locomotive which was delivered in 1857-59?
SELECT "Type" FROM table_59671 WHERE "Delivered" = '1857-59'
SELECT "Type" FROM "table_59671" WHERE "Delivered" = '1857-59'