The London Gateway Logistics and Commercial Centre Order 2007

5.  When signifying his approval or disapproval of the plans the engineer may specify any protective works (whether temporary or permanent) which in his opinion should be carried out before the commencement of construction of the specified works to ensure the safety or stability of railway property, the continuation of safe and efficient operation of the railways of Network Rail or the services of train operators using the same (including any relocation of works, apparatus and equipment necessitated by the specified works) and the comfort and safety of passengers who may be affected by the specified works, and such protective works as may be reasonably necessary for those purposes shall be constructed by Network Rail with all reasonable dispatch, or if Network Rail so desires, such protective works shall be carried out by the Promoter at its own expense and the Promoter shall not commence the construction of the specified works until the engineer has notified the Promoter that the protective works have been completed to his reasonable satisfaction.