The Rail Accident Investigation Branch (RAIB) has released its report into a collision between a train and a road vehicle on the M20 overline bridge at Aylesford on 5 February 2007. The full report is available here:

A summary of the key points from the report are - On Monday 5 February 2007 a bridge inspection unit working at the M20 was deployed over a railway bridge between Maidstone Barracks and Aylesford stations. The gantry on the bridge inspection unit was struck by a scheduled Southeastern service, causing significant damage to the leading carriage and wrecking the gantry. The train driver and the sole passenger were injured. Nobody was on the gantry at the time.

The railway line was open for normal rail services at the time and no possession had been granted to work on the railway. The incident was caused by a misunderstanding between the bridge inspector and the operator of the inspection unit.