Old bridge

I was wondering when to fit in the long run I wanted to do this week and then realised that as I have to work tomorrow I could take today off instead - and the forecast was good.
So it was out in the bright frosty morning for a run along the old railway line and through the woods. Underfoot was generally good and the sun and effort soon warmed me up.
The railway had a previous line and I think this old bridge might have been part of it.