 As a result of the apparent brakes failure all the class were taken out of service; it transpired that mechanical failure was not the cause and that the brakes had been rendered inactive by a control valve closed in the wrong position during maintenance.On 24 September 2009 locomotives 6415 and 6514 were involved in a head-on collision with an EMD 66 locomotive of ERS (No.6616) near Barendrecht.