43170 passes Callow Hill on 16 February 2016 with the 1L48 09:28 Swansea to Paddington GWR service. This had been running exactly to time until Chipping Sodbury, when it caught up with the late running 4O70 09:58 Wentloog to Southampton Maritime freightliner. Bizarrely, this was not looped, and so continued to get in the way until Swindon. By this time the HST was running 25 minutes late, a delay from which it did not recover. Note that this train is unusually running with the first class coaches at the country, rather than the London end.