RAILWAYS APPLICATIONS (EUROPE) In order to guarantee the same level of security in railways vehicles in the European Union in the event of a fire on board , the CENELEC (TC 256) has released a standard EN 45545 which has become a national standard for all member states. The standard specifies the level of safety (HLx :Hazard Level ) according to the requirements (location, application) and the type of vehicles (OC: Operation Category) . The level of safety (HL1 ,HL2 or HL3) will depend on the results obtained by the materials on specific test for level of oxygen index , smoke emanation and toxicity....