CREATE TABLE table_11335 ("Manufacturer" TEXT, "Type" TEXT, "Quantity" FLOAT, "SHT Nos." TEXT, "GWR Nos." TEXT)

How many have SHT number 5?
SELECT MAX("Quantity") FROM table_11335 WHERE "SHT Nos." = '5'
SELECT MAX("Quantity") FROM "table_11335" WHERE "SHT Nos." = '5'