Posted again, original deleted.
Absolutely right, once again. Just to add a little:
This lightweight steel bridge was built to carry a private siding from the Conwy Valley railway line at Dolgarrog Station to the Aluminium Works. It is still used for a nominally private road which runs along the course of the line and gives foot-access across the river, which is important since the nearest bridges are some miles away.
So what about this one which Hugo must have trampled across at some time?