Look again at the maintenance arrangements for wagons that primarily carry dangerous goods. That is the word from the Rail Accident Investigation Branch, the independent watchdog for safe operation of the railway network in the UK. The RAIB has ordered an urgent review of procedures, in the light of a serious derailment last summer, which saw an oil train with defective brakes come off the tracks in South Wales, resulting in a huge fire, significant infrastructure damage and a disastrous environmental incident.