DLR B23 Trains: London’s Brake Issue & Future Rail Capacity

DLR’s new B23 trains pulled from service due to a braking fault. TfL investigates, while older rolling stock maintains service on the railway.

DLR B23 Trains: London’s Brake Issue & Future Rail Capacity
November 14, 2025 7:46 pm
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Introduction

Three new B23 trains on the Docklands Light Railway (DLR) have been taken out of service after a braking fault caused one of the automated trains to overshoot a platform. The trains, which began operating in early October, were originally slated for introduction in April 2024. Transport for London (TfL) engineers are currently investigating the cause of the incident.

Main Content

Faulty Brakes and Service Withdrawal

The DLR removed the three new B23 trains after one overshot a platform. According to TfL, engineers are analyzing the root cause of the incident. Scott Haxton, TfL’s director of capital delivery infrastructure, stated that the incident was isolated and had no impact on customers. The timetable remains unchanged.

New Train Introduction and Customer Service

The new trains began service in early October, with an original launch date of April 2024. Haxton noted that introducing new rolling stock is complex and that performance-related issues are not unusual during the integration phase. TfL has apologized but has not confirmed a timeline for the repairs.

Operational Adjustments and Capacity

Older trains are covering the service gaps. The DLR, which carries 340,000 passengers daily, is also running a reduced timetable due to the retirement of one-fifth of its 90 trains, some of which have been in service since the early 1990s. TfL anticipates having 54 new trains in service by the end of next year.

Train Features and Expansion Plans

The B23 stock carriages, built by CAF, include air conditioning, mobile device charging, and dedicated spaces for wheelchair users. The walk-through carriages are expected to increase capacity by 50 percent. The Mayor of London stated that the new trains would improve reliability and support growth in areas like Stratford, Woolwich Arsenal, and the Isle of Dogs.

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Conclusion

Following a braking issue, three new B23 trains on the Docklands Light Railway have been withdrawn from service. TfL is investigating the cause, and older trains are being used to maintain service. The DLR is also operating a reduced timetable due to the retirement of older trains. TfL plans to have 54 new trains in service by the end of next year.

Company Summary

CAF: A Spanish company that built the B23 stock carriages for the DLR.

Transport for London (TfL): The organization responsible for the Docklands Light Railway.

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