The London Underground PPP operator, charged with upgrading one third of the Tube network, said: вЂњThe under-spend was because station upgrades have been delivered ahead of schedule and under budgetвЂќ.
Also, the timing of some track upgrade work has been altered to take advantage of weekend closures planned for other reasons.
In a quarterly performance report covering the January-March period, Tube Lines said: вЂњGood progress was made with the line upgrades. Testing has reached sophisticated levels and results are successful.
There were 43 zero delays over the quarter, an improvement on the 27 in the same quarter last year.Station modernisations/refurbishments
Work is mobilised, ongoing or has been completed during the latest quarter at: