London Underground is to meet with Balfour Beatty to probe why Tube passengers faced travel delays on Monday morning.
A late finish to the completion of weekend works by the contractor has been blamed for the rush-hour hold-ups.
The delayed engineering work and a broken down train hit services on the Central, District, Jubilee and Hammersmith & City lines.
London Underground’s managing director Mike Brown said: “London Underground is engaged in a massive upgrade programme to replace track, signals and trains to provide more capacity and smoother journeys.
“Works to improve the railway between East Ham and Barking over the weekend were not completed on time by our contractor Balfour Beatty, which meant unnecessary disruption to District and Hammersmith & City line services.
“This is simply not good enough and we are meeting with Balfour Beatty now to demand a full review of the works and that they ensure there is no repeat in future.
“I apologise to our customers for the disruption to their journeys this morning, and assure them we are working flat-out to improve reliability across the Tube.”