HomeBusinessInterim ORR report on Hitachi train cracks released

Interim ORR report on Hitachi train cracks released


The Office of Rail and Road (ORR) has said in an interim review that Hitachi Class 800 and 365 trains had been affected by stress corrosion and fatigue cracks. The result of this was a “significant” number of trains being withdrawn from service in May, it said in a statement.

ORR commended the industry’s quick response and the work undertaken to safely reintroduce the trains into service.

Cracks found in the area of the bolster close to the yaw damper bracket and anti-roll bar fixing points were a result of fatigue, and cracks found in the area where the lifting plates attach to the vehicle body were the result of stress corrosion cracking.

Anti-roll bar and yaw damper connection points and lifting plate on a Class 800 train bogie.

Stress corrosion cracking occurs when susceptible materials are exposed to a specific corrosive substance while subject to stress.

The interim report says the industry worked together as soon as the cracks were identified to quickly withdraw the trains and put in place a process to assess which trains could go back into service.

Since being returned into service, trains have performed as specified, with no unsafe conditions or harm arising from the cracking.

A final report, after further work with Hitachi and the industry, is expected in December.

Ian Prosser, ORR.

HM chief inspector of railways at ORR, Ian Prosser CBE, said: “Our interim findings confirm the cracking in the yaw damper and lifting plate are a result of fatigue and stress corrosion cracking – and that Hitachi made the sensible decision to withdraw all trains.

“Since then, the majority of trains have been put back into service with no unsafe conditions and no harm arising from the cracking.

“I welcome the good collaboration that has taken place since this issue arose. We are continuing to work with all parties to determine the root cause and will publish our final report in December.”

The final report will look into the root cause of the cracking, and consider Hitachi’s plans regarding the long term fleet recovery and management. It will identify any areas for improvement for the industry.

In June, ORR published its review of the impact on passengers which found train operators affected by the cracks provided clear and consistent information to passengers during the disruption.

ORR’s passenger review also identified areas aimed at further reducing the impact on passengers should similar disruption occur in future.


Please enter your comment!
Please enter your name here

- Advertisement -

Latest news

Rail engineers strike gold in sustainability school

Multidisciplinary engineering business Dyer & Butler has earned Gold level status from the Supply Chain Sustainability School (SCSS). This is the highest level of membership...

Tunnel operation takes flight with help from a helicopter

Essential work on a tunnel in the Peak District got some help from high places. Helicopters helped airlift construction materials into position as part of...

Rail review author calls for rail fares reform

Keith Williams, co-author of the Williams-Shapps Plan For Rail white paper, has urged for fares reform – arguing there has never been a better...
- Advertisement -

More news

Iconic arrows get a dash of green ahead of environmental summit

The famous National Rail double arrow has turned several shades of green ahead of the COP26 UN climate summit, which takes place in November. The...

Digital signalling for East Coast main line tested on Thameslink

A test of the digital in-cab signalling system ECTS level 2 (European Train Control System) has been carried out successfully using a Govia Thameslink...

Potential union of unions across the Atlantic

In what is a possible world’s first, London-based transport and travel union the TSSA is in talks with America's International Brotherhood of Boilermakers on...