Despite the signal showing a green aspect this eastbound First Great Western HST stopped at signal UM154 B between Newport and Severn Tunnel Junction and the driver got out to use the signal phost telephone.
There is considerable foreshortening in this photograph - it was taken from the rear of the second last carriage of the eight-coach HST - the signal is further away than the lead powercar.

Photo by Chris McKenna 10/05/2006.
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