(Why) are Dutch cargo trains 2.6 times more often involved in SPADs compared to passenger trains?

Based on Dutch Rail Inspectorate's statistics on the years 2002-2006 cargo trains are 2.6 times more often involved in Signals Passed At Danger (SPADs) per million train kilometres than passenger trains. Intergo was commissioned to investigate the causes of this difference and to formulate related measures. The basis for...