The running track, rolling stock and locomotives are all part of the M Shed Working Exhibits. When not running trips, the engines Henbury and Portbury can be seen in the West End Foyer of M Shed. The fleet of historic wagons can be seen in the sidings on Wapping Wharf.
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Further information on trips can be found in the Heritage Article - Bristol Harbour Railway in this website.
Google Map - Bristol Harbour Heritage Railway Trips