31320 & 31467 reduce speed to little more than a crawl, as they approach the extremely sharp curve at Firsby (a relic of the junction with the former line to Louth) with the 1D22 10:42 Skegness to Leeds service on 17 September 1988. This was the second double headed working within half an hour, 20005 & 20048 having passed by a little earlier.