TfL DLR Braking Issue: CAF B23 Train Suspension in London

Introduction

Transport for London (TfL) has temporarily withdrawn its new B23 trains from Docklands Light Railway (DLR) service due to a braking issue identified during wet weather conditions. The decision follows an incident where a train, manufactured by CAF, failed to stop at the intended platform position.

Braking System Issues

The braking issue was discovered in the new B23 trains, with the older DLR fleet remaining operational and unaffected. The problem occurred because of reduced adhesion due to rain. TfL engineers, along with teams from KeolisAmey Docklands and CAF, are working together to identify the cause of the problem and implement a solution.

TfL Response

According to Scott Haxton, TfL’s capital delivery infrastructure director, “There’s been no injuries or any negative impact to our customers, it was an isolated incident. The timetable is operating as it was. From a customer service point of view, it’s very much business as usual. Introducing new rolling stock onto any operational railway is incredibly complex and it’s not unusual to experience sort of performance related issues as they are bedding into the new network.”

Fleet Modernization and Capacity Expansion

TfL introduced 54 new DLR trains last month. The rollout of these new trains will continue in the coming months, and once all 54 trains are in service, overall DLR capacity will increase by more than 50%. The full replacement of the older fleet is expected to be completed by the end of next year.

Gibson’s Engineering Contract

In June 2025, Gibson’s Engineering, a train repair centre in Glasgow, Scotland, secured a contract with TfL to refurbish 23 long vehicle wagons over a two-year period.

Conclusion

TfL has temporarily suspended the B23 trains from DLR service due to braking issues in wet weather. The older DLR fleet remains in operation, and TfL is working with CAF and KeolisAmey Docklands to resolve the issue. The new train rollout continues, aiming to increase DLR capacity by over 50%. Gibson’s Engineering has a contract to refurbish wagons.

Company Summary

TfL: Transport for London, responsible for the operation and maintenance of the Docklands Light Railway.

CAF: The manufacturer of the new B23 trains.

KeolisAmey Docklands: A company working with TfL on the DLR.

Gibson’s Engineering: A train repair centre in Glasgow, Scotland, that has a contract with TfL.