C811 (51519, 59548 & 51801) & Class 117 B439 (51390, 59500 & 51348) pass Marshfield on 28 April 1984 with the 09:55 Cardiff Central to Bristol Temple Meads service. By the 1980s virtually all surviving DMU classes employed the Blue Star multiple working system, so despite there still being many different classes, from several different manufacturers, there was no problem in running trains such as this. This degree of standardisation has unfortunately not been totally perpetuated with modern units. For example a Class 158 cannot work in multiple with a Class 165, not that the need would ever arise!