The following extract from Wildman's Almanac (Settle) appears on page 12 of Mitchell, W.R: “How they built the Settle-Carlisle railway”, Castleberg (1989):
"The line [near Langcliffe] enters a solid blue limestone cutting at the entrance of which a pretty light iron girder bridge is finished for the footpath leading from Langcliffe to Langcliffe Place and Mills: it is also spanned in two places by "fly-arches" which start from the solid rock and are about 42ft span. In this cutting are a few spar lodes charged slightly with copper, and we should think it looks a likely place for lead if a shaft was sunk to a greater depth. W.A. (1874)"
This suggests that the lattice girder footbridge known as "Christie's Footbridge" may date from the line's construction.