The class 43 HST units were designed by BR and developed between 1975 and 1982. These units were used all over the country and, due to their sleek design and ability to reach high speeds in short distances, they were instantly a favourite for railway operators. They were ideal for non electrified routes (which were common in the 1970's and 80's). There are still over 150 of these units in service and some have been converted to New Measurement Trains (NMT), also known as the Flying Bananas, by Network Rail. This set contains a four-car HST complete with a head and tail unit and two coaches. This GWR 'Castle Set' is supplied with 43093 'Old Oak Common HST k.