Shark Ballast Plough Brake Van Nº. DS62862. This 20 ton ballast plough brakevan was built in 1949 to an SECR design of 1914. It is a most interesting vehicle that uses ploughs to spread ballast evenly along track. it proved more than useful in relaying the thousands of tons of ballast on the Millennium extension.In Common with the other ballast Brakes of differing designs it is known by the telegraphic name of 'Shark'.