The inquiry into the Paddington train crash is headed by the senior Scottish judge Lord Cullen.
It will try to establish why the crash took place and also consider how rail safety is regulated.
The inquiry itself has been split into two parts - the first of which ended in late July 2000.
This first part is being followed by a separate "joint inquiry" into factors common to both Paddington and the Southall crash, which took place in 1997. This investigation is chaired by Lord Cullen and Professor Uff, who chaired the Southall inquiry.
Part two of the Paddington inquiry - officially known as the Ladbroke Grove Rail Inquiry - is scheduled to begin in October 2000.
Here is a chronological guide to the main news stories since Lord Cullen's inquiry into the Paddigton crash began.
Anger as crash inquiry begins
Survivors and bereaved relatives voice their anger at the decision not to bring manslaughter charges.
Train chiefs 'put shareholders before lives'
Thames Trains paid shareholders nearly £7.5m in dividends - but refused to spend £5.26m on a life-saving train protection system, the inquiry hears.
Train crash hero praised
A passenger involved in the Paddington rail crash describes how he helped drag a badly burned man to safety.
Passenger forced to climb over bodies
A passenger who was travelling in the Great Western express, breaks down in tears as he recalls how he had to climb over bodies to escape the twisted wreckage.
Rail crash failings conceded
Passengers trying to escape from the Paddington rail crash did not have enough safety details, the owners of one of the trains involved concedes.
Union rebuked over Paddington smear
The inquiry reprimands a rail union over its allegation that Railtrack spread "malicious rumours" about one of the drivers who died in the disaster.
Paddington train lacked safety kit
Passengers trapped in one of the trains had no emergency hammers to smash their way out, the inquiry hears. Fear of vandalism meant all hammers had been removed, leaving only a crowbar in an emergency cupboard at the time of the crash.
Alarm delay in Paddington Crash
The duty signaller at the time of the Paddington rail crash tells the inquiry how he did nothing for up to 25 seconds after watching one train pass a red light.
Paddington driver 'had no route map'
New train driver Michael Hodder had to rely on handwritten plans of his route because rail bosses did not provide proper maps, the inquiry is told.
Train driver recruitment 'flawed'
There were errors in the recruitment and training of the Thames Trains driver at the centre of the Paddington rail crash, admits the company's director.
Railtrack 'ignored safety proposals'
Railtrack bosses ignored suggestions to improve safety on the approaches to Paddington Station for almost five years, the inquiry hears.
Railtrack 'ignored safety recommendations'
The inquiry hears that Railtrack ignored key recommendations arising from an earlier inquiry into a train collision in 1995 at Royal Oak, near Paddington. It called for a feasibility study into the misreading of signals on the track.
Rail safety inspectors 'overworked'
The inquiry is told that railway inspectors missed safety concerns before the Paddington train crash because they were overworked. Chief Inspector of Railways Vic Coleman said his staff had to juggle many jobs and were unaware of problems with the signal blamed for the accident.
'Safety relaxed' before Paddington crash
Railtrack chief executive Gerald Corbett says a team of men trying to improve safety on the stretch of track at Ladbroke Grove might have relaxed their efforts after the number of instances of trains passing red lights dropped.
Final evidence on Paddington crash
Closing submissions in the first stage of the Ladbroke Grove Rail Inquiry.
Crash survivors demand safer trains
Survivors of both the Paddington and Southhall rail disasters urge the government to adopt the Automatic Train Protection (ATP) safety system rather than the cheaper alternative, the Train Protection Warning System (TPWS).
Memorial marks train crash
A memorial service to mark three years since the Southall crash is held in London - as the joint inquiry into the Southall and Paddington disasters begins.