The line speed upgrades have been done as part of the Feltham & Wokingham resignalling project. Link to surrey country council website = https://www.surreycc.gov.uk/land-planning-and-development/development/surrey-future/the-surrey-rail-strategy and link to network rail website about Feltham and Wokingham resignalling = https://www.networkrail.co.uk/running-the-railway/our-routes/wessex/feltham-and-wokingham-re-signalling-programme/