After the 1L52 10:28 Swansea to Paddington First Great Western HST came to a stand near Cholsey station with brake problems on 15 November 2013, the following services started to stack up behind it. Here we see 43025 The Institution of Railway Operators leading the 1A17 12:30 Bristol Temple Meads to Paddington, unusually running along the up relief line, in order to overtake 43189 which is stopped at signals with the 1L54 11:55 Cardiff Central to Paddington.