Ramsey Harbour Swing Bridge and adjoining viaduct were built by the Cleveland Bridge & Engineering Co., Darlington and opened on June 29th 1892. So they are even older than Granddad.
They link Ramsey town centre with the Mooragh promenade. The bridge was extensively refurbished over the winter of 2013 - 2014. So perhaps some parts are younger than Granddad.
We reckon both deserve their own cache.
To find it, go to the co-ordinates and look at the plaque which commemorates a very sad event.
The date born will give you A.B.C The date taken will give you D.E.F
Go to N54 19. (A+F) (E-F) W004 22. (B+C-(E-F)) (A-(E+F))
Then go 8 metres at a bearing of 156 degrees to find the cache.