YouTube channel Unseen Steam recently posted this video of a railtour visit to Avonmouth in the days of steam.
On 21st July 1963 the RCTS ran what has been described as a “chaotic” railtour (not their fault) from Paddington to the Bristol area behind ‘Grange” class no. 6841 “Marlas Grange” which got the train to the Docks almost bang on time after a good run down the GWR main line to Swindon and then the connection to the Docks at Hallen Marsh Junction. In the Docks the train was worked by one of the Port of Bristol Authority’s tank locomotives, no S11 “Bristol”. All went well until the train was due to leave the Docks which took place around half an hour late. Further troubles ensued, with the train returning to London some one and a half hours late – many passengers had detrained at Stroud to try and find a quicker train home! (Information from http://www.sixbellsjunction.co.uk, with thanks to Gary Thornton)