The Great Western Society has had a train named after it by operating company First Great Western.
The nameplate's unveiling took place at Didcot Railway Centre, in Oxfordshire, at 12:00 on Saturday.
The naming was in honour of its half century of work to preserve railways in the UK.
Chairman Richard Croucher said, "We look forward to seeing it traverse the old Great Western Railway territory over the forthcoming years."
The nameplate on the power car reads, "Great Western Society 1961-2011, Didcot Railway Centre".
High speed trains travel up to 125 mph and have a power car at each end.
The Great Western Railway was the route through Didcot from Bristol to London designed by Isambard Kingdom Brunel and completed in 1841.
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