Timings now in the open data feeds:
Empty working from Southall arrives at Waterloo at 0751
5Z80 05+53 Southall Wcr to London Waterloo
http://www.realtimetrains.co.uk/train/U55460/2019/06/04/advanced
Then first train leaves at 0805 using the Latchmere curve to avoid disrupting the morning peak trains on the Windsor lines too much, joining the Hounslow loop at Kew East Junction.
1Z80 0805 London Waterloo to Windsor & Eton Riverside
http://www.realtimetrains.co.uk/train/U55425/2019/06/04/advanced
Arrives Windsor at 0936 - seven minutes to detrain passengers before the empty stock goes back to Waterloo, again via Willesden
5Z81 09+43 Windsor & Eton Riverside to London Waterloo
http://www.realtimetrains.co.uk/train/U55426/2019/06/04/advanced
Arrives at Waterloo at 1108 for ten minute boarding before the second train departs at 1118. This one goes via Clapham Junction to the Hounslow loop.
1Z82 1118 London Waterloo to Windsor & Eton Riverside
http://www.realtimetrains.co.uk/train/U55428/2019/06/04/advanced
Arrives Windsor at 1236 (although there is 11 minutes of pathing allowance between Staines and Windsor) - again seven minutes to detrain and return direct via the Hounslow Loop to Waterloo.
5Z82 12+43 Windsor & Eton Riverside to London Waterloo
http://www.realtimetrains.co.uk/train/U55429/2019/06/04/advanced
Arrives at Waterloo at 1350 for a longer boarding period before the third train departs at 1409. Again, this one goes via Clapham Junction to the Hounslow loop running immediately behind the 1407 from Waterloo stopping service.
1Z83 1409 London Waterloo to Windsor & Eton Riverside
http://www.realtimetrains.co.uk/train/U55430/2019/06/04/advanced
Arrival at Windsor at 1527. Departure at 1543 for Waterloo. This one goes via Willesden and is held there for two hours. Originally it was advertised that there would be a 1800 departure from Waterloo for the Surrey Hills tour but that seems to have been a bit optimistic. Instead, the empty working gets to Waterloo at 1910.
5Z83 15+43 Windsor & Eton Riverside to London Waterloo
http://www.realtimetrains.co.uk/train/U55151/2019/06/04/advanced
Departure from Waterloo is at 1925 and this one goes via Richmond behind the behind the 1920 to Reading and then after Barnes between the 1915 to Hounslow and the 1928 to Windsor through to Staines Down Goods Loop. Here the 1928 from Waterloo to Windsor and 1935 to Reading both pass by.
1Z84 1925 London Waterloo to Chertsey
http://www.realtimetrains.co.uk/train/U55149/2019/06/04/advanced
After a 13 minute wait at Chertsey, the train proceeds through Woking, Guildford and the North Downs line returning to Waterloo via Streatham, Herne Hill and the Linford Street flyover for a 2300 arrival in Waterloo.
1Z85 2049 Chertsey to London Waterloo
http://www.realtimetrains.co.uk/train/U55150/2019/06/04/advanced
The empty stock working leaves Waterloo for Southall at 2310
5Z84 23+10 London Waterloo to Southall Wcr
http://www.realtimetrains.co.uk/train/U55452/2019/06/04/advanced
The obvious problem with these trains will be where they get up any speed following stopping trains. This must all have taken some considerable effort to path.
It is also interesting to see where they take on water. Clearly there is an opportunity at Willesden after the three Windsor trains but there aren't any particularly long stops otherwise.