The line is now leased by Metronet (now LUL) in order to test and commission the next generation of London Underground trains, known as Sub Surface Lines (SSL) trains.

Serco Assurance were awarded the contract to manage the whole of the test track of behalf of Metronet (LUL), which gave them the opportunity to attract other interested parties to the line but there have not been many takers.

Since October 2013 NR have taken over following the demise of BRB Residuary and are starting some preliminary works