I don't have a source for the following obscure 'Possible fact' - I recall reading somewhere, something about an overbridge way down south on the
GCR» route to Wales/the South West/London: it may have been the one on the following link - and there's no opportunity to check on the ground as its deck will have gone for scrap.
If, in 1971, as teenagers, we hadn't reneged on an ambition to leave the skiff by the site of the (span lifted) bridge taking the GCR across the Grand Junction Canal to walk south to Catesby Tunnel and hopefully back, it would have been the first bridge that we would have passed beneath and we could have checked the following factoid first-hand.
https://www.railwayarchive.org.uk/record?rnum=L2330&os=1... by the mid 1950s that bridge's steel deck needed replacing - and the replacement included Woodhead-style supports for the overhead electrification that would surely be making its way south.
Mark