CREATE TABLE table_5851 ("Designation" TEXT, "Car numbers" TEXT, "Manufacturer" TEXT, "Model No." TEXT, "First used" TEXT, "Quantity" FLOAT)

Which Designation has a Manufacturer of siemens, and a Quantity of 52?
SELECT "Designation" FROM table_5851 WHERE "Manufacturer" = 'siemens' AND "Quantity" = '52'
SELECT "Designation" FROM "table_5851" WHERE "Manufacturer" = 'siemens' AND "Quantity" = '52'