cehwitham
The dates and places of these two notes match the road bridge demolition and rebuild for the railway upgrade. Presume note was trying to mark the temporary closure but new bridges reopened on these routes. 
https://www.networkrailmediacentre.co.uk/news/timelapse-triple-bridge-demolition-work-completed-in-monmouthshire-as-preparation-for-railway-electrification-continues
