On 4 October 2003 the Cotswold Line Promotion Group ran the 'Cotswold - Taff Express' special train from Oxford to Cardiff using the unusual unit combination for the Cotswold Line of 158956 & 156405. The special is pictured arriving at Moreton-in-Marsh. Although Class 156s were used on the line for a short period, Class 158s have never been regularly used and therefore this is certainly a unique pairing for the route.