The announcement that Crossrail could be delayed even further and cost up to £2 billion more than its most recent budget are the latest issues to hit the London engineering project.

More time is needed to complete the stations and tunnels and carry out safety and reliability testing for the new east-west railway, Transport for London said.

The service, which will be known as the Elizabeth line when it launches, was already a controversial project due to concerns over delays, funding and safety.

– Delays

There have been a number of proposals for a Crossrail-style railway since the 1940s, but it was not until July 2008 that the current scheme was given parliamentary approval.

Services were originally due to begin in 2017, but a decision was made in October 2010 to push this back by 12 months.

The start date of December 2018 was delayed until autumn 2019 but Crossrail Ltd says it “cannot at this stage commit” to the revised date.

– Budget

Crossrail’s budget was set at £15.9 billion in 2007, but this was cut to £14.8 billion in the Conservative and Liberal Democrat coalition government’s Comprehensive Spending Review in 2010.

In July it was announced that £600 million of additional funding was required as Crossrail Limited and Network Rail both needed more money to complete the project.

On Monday it was announced that the delays will cost up to £2 billion.

Elizabeth Line
A purple roundel to mark the Elizabeth line (Transport for London/PA)

– Safety

Contractors working on the project were fined more than £1 million in July last year over the death of a worker and two other incidents.

A joint venture of three companies, Bam, Ferrovial and Kier (BFK), pleaded guilty to three offences at Southwark Crown Court following an investigation by the Health and Safety Executive (HSE).

Construction worker Rene Tkacik, 44, died after being crushed by falling wet concrete in March 2014.

Two other men were injured in separate incidents within six days of one another in January 2015.

The HSE said the incidents could have been prevented if “simple measures” had been taken.

– Investment

Investment in Crossrail has fuelled frustrations among people who believe regions such as the north of England are being discriminated against in terms of transport funding.

Think tank IPPR North claimed earlier this year that planned transport investment in London is two-and-a-half times higher per person than in the North.

The Department for Transport disputes the figures.

Transport Secretary Chris Grayling sparked anger in July 2017 last year by supporting a new £30 billion Crossrail 2 north-south scheme in London days after a series of rail electrification projects in Wales, the Midlands and the North were axed or downgraded.