22 July 1995 marked the final booked use of a pair of Class 37s on the famous Burngullow to Irvine 'Silver Bullet' china clay tanks (although they are obviously not quite so silver by this date!). With appropriate headboard, which reads: 'Last Silver Bullet Syphons', 37670 St Blazey T&RS Depot & 37669 pass Pilning with the 6B68 09:40 Burngullow to Alexandra Dock Junction. The train would work forward to Scotland the following day with 60037 as the 6S55 17:00 Alexandra Dock to Irvine.