during the first day of passenger operations at Blackpool the first tram of the day to Fleetwood 006 derailed due to sand in the rails. something that you would have thought would be a very large potential problem in Blackpool.
http://www.bbc.co.uk/news/uk-england-lancashire-17607881
http://www.bbc.co.uk/news/uk-england-lancashire-17607881