The document summarizes a trial conducted in the UK to use passenger trains to apply adhesion modifier ("traction gel" or "sandite") to rail heads during service, in order to combat poor adhesion conditions during autumn. The trial involved fitting a Mark 3 Driving Van Trailer with prototype equipment to lay down adhesion modifier. The trial on the Liverpool Street to Norwich line was successful, with no operational issues and good coverage of the line achieved. The article discusses the potential for this approach to increase the coverage of rail head treatment compared to conventional methods.