6415 and 6514 were involved in a head-on collision with an EMD 66 locomotive of ERS (No.

6616) near Barendrecht close to the point the line passes under the A15 motorway.

[3] The cause of the collision was found to be partly due to a heart condition of one of the train drivers, and it was thought likely that the driver passed a red signal due to illness; additionally the automatic halting system on the track was of an outdated type.

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