91124, GR 09.30 London Kings Cross-Edinburgh (1S10, 4L), Langford TL192404
91124 leads the 09.30 King's Cross to Edinburgh Waverley at
some speed past Langford in Bedfordshire. This long section of dead straight track means that these 140mph (225kph) capable class 91s can really get going up to their permitted 125mph.