Oh, Ye of little faith ...
The Rail Accident Investigation Branch have now published
their full report on this incident, on their website:
Summary
During the evening of Saturday 14 November 2009, the foundations of a Victorian bridge carrying the railway over the River Crane near Feltham in West London failed without warning, causing part of the bridge to subside. The first indication of a problem was a track defect reported by a train driver crossing the bridge on the up line. Track maintenance staff, called to the site, immediately blocked the up line to all traffic when they became aware of a serious defect with the bridge. The down line was blocked shortly afterwards.
A total of 21 trains crossed the failing bridge between the first report and closure of the line. There was no derailment and no injuries occurred.
The RAIB▸ have made five recommendations to Network Rail concerning the management of structures, and one recommendation to the Environment Agency concerning notification to railway infrastructure owners when obstructions are found against a structure.