GBR rolling stock strategy draws praise for pipeline, criticism on whole-system gaps

Great British Railways' new Rolling Stock and Infrastructure Strategy commits to a stable long-term investment pipeline of standardised fleets, level boarding, an end to diesel traction and greater infrastructure monitoring by passenger trains — but critics say it stops short of the whole-system engineering GBR has promised.

The strategy, published by GBR, sets out how its new train fleet management function will take an integrated approach to depots and train maintenance. Those positives are real. The gaps are equally concrete.

Why the BEMU choice raises cost questions

Battery Electric Multiple Units are the strategy's principal solution for replacing diesel units. As an analysis of the BEMUs procured for TransPennine Express shows, battery trains carry significant additional operational and capital costs. The physics compounds the problem: train power demand rises broadly with the cube of speed, so a 100 mph BEMU requires more than twice the power of a 75 mph train, demanding very large batteries.

BEMUs may suit TransPennine Express. A network-wide view could instead show full electrification delivers more capacity at lower whole-life cost, particularly on routes carrying InterCity and freight traffic. Scotland's fleet strategy takes that position while acknowledging BEMUs as a possible transitional solution.

What does the strategy leave out?

The RSIS accepts the electrified network must expand and stresses better electrification delivery, yet it does not commit to a rolling programme of electrification — widely regarded as the most effective delivery model.

A second omission is any strategy to resolve network capacity limits. ETCS capacity benefits have been widely promoted, but on a mixed-traffic railway they are minor: the dominant constraints remain infrastructure configuration and the mix of trains with different performance and stopping patterns.

The strategy expects ETCS to reduce whole-life cost, yet implementation is proving expensive. It acknowledges high rolling stock retrofit costs but omits the cost of fitting ETCS to new trains, which industry sources put at around £0.5 million per train. The East Coast Digital Programme, announced at £1.9 billion in 2024, has since been rebaselined to higher expenditure.

On freight-heavy routes, 90 mph electrified intermodal freight trains offer large capacity gains: in timetabling terms they behave like 125 mph stopping passenger trains. Increasing electric freight traction could be the most cost-effective capacity measure on mixed-traffic routes — but the RSIS considers passenger trains only and misses this benefit entirely.

The wider engineering context

Matt Prosser, new Chair of the IMechE Railway Division, stressed whole-system thinking in his Chair's Address, including gauge-clearance, funding for adhesion mitigation, the complexity of battery trains — which he judges suitable for lower-frequency, non-freight routes — and the capacity benefits of electric freight.

Irish Rail maintains whole-life maintenance capability, including heavy overhauls, for all its trains. With the RSIS weighing whether GBR should own its own fleet and rethink maintenance, the Irish stewardship model offers a tested reference point.

The Chartered Institution of Railway Operators' policy document 'Locally empowered, nationally coherent' addresses how a large complex network can make best whole-system decisions rather than optimising one part at a time; much of it applies beyond operations.

Elsewhere in the issue: Kevin Chivers examines safety integrity of staged signalling control transfers from relay to computer-based interlockings via a proportional SIL-Allocation Method; Paul Darlington assesses the likely cause of the communications failure at Manchester Rail Operations Centre that caused massive disruption; and David Fenner reviews TPWS, noting it has dramatically reduced signals passed at danger but has limitations.

Two track-distortion derailments on consecutive days, previously very rare, and hotter summers put track-buckle mitigation in focus. More than a thousand people walked the closed Greenside tunnel between Leeds and Bradford as a possible active travel route; the 1846-built Bridge 42, carrying the North Yorkshire Moors Railway, needed its arch propped before permanent repair.

The 22-day Hungerford Bridge blockade succeeded through meticulous integrated planning by the Southern Renewals Enterprise. The Transpennine Route Upgrade reports social value gains, carbon reduction funding, net biodiversity gain and £405,507 spent on community projects.

The issue also remembers Don Heath, who delivered the seven-year East Coast Main Line electrification almost on time and on budget — a legacy later undermined by poorly managed schemes that cost the industry Government trust. With recent schemes delivered cost-effectively and electrification costs falling, the industry now has grounds to win that trust back, and a rolling programme would be the proof.