20. The operator of a train which is being used for the carriage of dangerous goods shall ensure that all necessary precautions are taken during the marshalling or formation of that train to prevent the creation of a significant risk or the significant increase of any existing risk to the health or safety of any person.
21. Every person engaged in the carriage of dangerous goods shall take all reasonable steps to ensure that—
(a)nothing is done during that carriage to create a significant risk or significantly increase any existing risk to the health or safety of any person; and
(b)unauthorised access to the dangerous goods concerned is prevented.
22. A person shall not cause or permit anything to be done which is liable to create a significant risk or significantly increase any existing risk of a fire or an explosion whilst dangerous goods are being carried in any container, package, tank container, tank wagon or wagon.
23. Each train operator, facility owner and infrastructure controller shall—
(a)draw up and, where appropriate, give effect to such safety systems and procedures as will adequately deal with any emergency involving dangerous goods—
(i)being carried by the relevant train,
(ii)present at the relevant railway facility, or
(iii)present on the relevant railway; and
(b)co-operate with each other so as to ensure effective co-ordination of their respective safety systems and procedures.