The locomotive preserved at Beamish is indeed the former Seaham Harbour Dock Company No.18, built in 1877 (Works No.683) as a well tank, later modified with side 'wing' tanks and in 1936 outshopped as a saddle tank after extensive rebuilding at the Seaham Harbour Engine Works.
The above dates are a result of new research by the curator currently charged with restoring the locomotive to working order (as a saddle tank) and can be verified against assumptions made in some established texts. The locomotive was supplied to the Londonderry Railway, who operated Seaham Harbour, transferring to the SHDC in 1899 upon the latter's incorporation.
Withdrawn from service in 1969/70, the locomotive was condemned as a working engine, later being transferred to the collection at Beamish (The North of England Open Air Museum). In 1977 it was 'restored' to its as-built appearance by Laings of Hartlepool, returning to Beamish where it was operated for four years. It was later loaned to a group based at Padiham Power Station, though their restoration attempt failed. Returned to Beamish it was placed on display with some work to restore it being completed before a serious bid was commenced in 2005. Still some way off steaming, the locomotive will return to action at Beamish in the next three years or so, hopefully making guest appearances at its former stamping ground at Seaham Harbour.
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