the controls and does not acknowledge the vigilance alarm, the vigilance system is activated and makes an emergency brake application. All trains have also been fitted with data loggers to record the driver's and guard's actions as they work the train, as well as the train's speed. Such a system had been fitted to G7, but was in the early stage of fleet roll-out, and hence had not been commissioned and switched on at the time of the accident. Rescue workers who attended the scene were impeded from accessing the trapped passengers on the train because they did not have the keys required to open the emergency exit doors. Emergency exit mechanisms have all been modified, to allow them to be used without requiring a key. RailCorp has installed internal emergency door release mechanisms on all new trains. However many passengers found their own way out since the train was broken into three pieces during the accident. Automatic train protection (ATP) could possibly have prevented the accident. Railcorp has tested ATP systems on the Blue Mountains line in western Sydney, and plans for ATP implementation across the Sydney Trains and NSW TrainLink Intercity/Regional networks are being formulated. CityRail/RailCorp incorporated emergency door releases on the insides of the new Waratah trains as a result of the inquiries to this disaster, enabling passengers to open the doors themselves in case of an emergency, where the crew are incapacitated and the train is at a standstill. The 2004 changes to medical assessments of rail workers were developed in response to the incident. Overseen by the National Transport Commission, Cardiac assessments are mandatory for certification and re-certification with a proscribed mandatory checklist as part of the national standard in the interest of ensuring public safety, the intended purpose of the health assessments whereas previously the health assessments did not have an occupational risk but a clinical focus. References External links Special Commission of Inquiry into the Waterfall Rail Accident 2003 in Australia 2000s in New South Wales Derailments in Australia Disasters in Sydney January 2003 events in Australia Railway accidents in 2003 Runaway train disasters Railway accidents and incidents in New South Wales 2003 disasters in Australia