Aecom to shape depots for Bakerloo fleet replacement

UK: Transport for London has appointed Aecom to lead feasibility work on depot and siding changes for the Bakerloo fleet replacement, preparing infrastructure for future rolling stock.

Aecom, supported by Arcadis, will lead multidisciplinary planning, systems engineering, rail, environmental and digital work for the Bakerloo Line Upgrade. The appointment is expected to culminate in a coordinated baseline design covering Stonebridge Park Depot, the Queen’s Park area and London Road sidings at Elephant & Castle.

Three sites, three infrastructure roles

The three locations are expected to serve different functions in the future operating plan. In a February 2026 preliminary market engagement notice, TfL said its emerging Stage 1 scope envisaged reconstructing Stonebridge Park Depot to consolidate maintenance activities, expanding the Queen’s Park area to add stabling capacity, and minimally adapting London Road sidings for continued stabling while adding a driver training facility.

That notice described an indicative future works package rather than an awarded construction contract. The Aecom feasibility study therefore sits upstream of final design and delivery, helping TfL establish a coordinated baseline before later procurement and construction decisions.

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Fleet replacement remains a staged programme

The infrastructure work is being developed around replacement of the Bakerloo line’s 1972 Tube Stock. The current trains entered service more than 50 years ago and are the oldest fleet in daily passenger operation in the UK.

TfL has been building the funding and procurement framework for renewal in stages. A 2025 Spending Review settlement provided £2.2 billion of capital funding for 2026/27 to 2029/30 to support rolling-stock upgrades across the Piccadilly, Bakerloo and Central lines and the DLR. The settlement does not by itself represent a completed Bakerloo train order.

TfL’s February 2026 market-engagement material said the authority intended to introduce new rolling stock and was shaping Stage 1 infrastructure works to enable that fleet. It indicated that those works could run to around 2034, while explicitly stating that the engagement was pre-procurement and did not commit TfL to a future contract.

For the current Aecom commission, the immediate output is the baseline design for depots and sidings. That keeps the focus on the enabling infrastructure needed before replacement trains can be accommodated, maintained and stabled across the Bakerloo line.