Look out for GWR trains being diverted to Euston station on Sunday

This is something for train nerds to look out for, as this weekend will see the first of many weekends of engineering works that will see GWR trains diverted to Euston station.
GWR train at Euston from previous test trip (c) ianVisits
GWR trains usually run to and from London Paddington station, but this weekend, there are engineering works on the mainline railway at Old Oak Common, closing the line between Ealing Broadway and Paddington.
Most GWR services from the west of England will terminate