RAIL powers are set to become the next front in the constitutional tug-of-war between Cardiff Bay and Westminster after the Liberal Democrats tabled an amendment to the UK Government’s Railways Bill calling for the full devolution of rail responsibility to Wales.

The party says Wales should be placed on the same footing as Scotland, with control over rail infrastructure, services and funding transferred to Welsh Ministers within two years. If selected for a Commons vote, the amendment would force MPs to take a clear position on whether Wales should hold the same levers Scotland already has — or continue under a system where key decisions remain reserved to Westminster.

Welsh Liberal Democrat Westminster spokesperson David Chadwick MP said Wales had been treated as an “afterthought” on rail investment for too long, and argued that projects based entirely in England have repeatedly been treated as “England and Wales” schemes for funding purposes — a classification he said has left Wales losing out on investment worth billions.

“This amendment is about fairness,” he said. “It would give Wales the same control Scotland already has and stop us losing out on billions of pounds for rail projects that don’t even touch Welsh soil.”

A split system with uneven power

Rail responsibility in Wales is currently divided. The Welsh Government oversees Transport for Wales and the Wales and Borders rail contract — the face of day-to-day passenger services — but most rail infrastructure decisions remain in Westminster hands through UK-controlled structures.

Critics say the arrangement leaves Wales stuck in the worst of both worlds: expected to deliver improvements, timetables and passenger experience while lacking full control over the track, long-term investment pipeline and major infrastructure funding.

Supporters of full devolution argue it is impossible to run a coherent transport strategy when responsibility is split — and that Wales is left dependent on consultation rather than authority.

Why it matters in West Wales

In Pembrokeshire and Carmarthenshire, where communities are more reliant on a limited number of rail corridors, the impact of investment decisions made elsewhere can be felt more sharply than in big cities with multiple alternatives.

Campaigners regularly point to the practical issues affecting West Wales passengers: reliability problems, the vulnerability of services to disruption on single-track sections, limited frequency, and the knock-on effect when services are cancelled or delayed because the system has little spare capacity.

There is also a wider economic argument. Better rail connections can influence commuting options, tourism flows, access to education and training, and business confidence — but rural and coastal routes can struggle to win funding in competition with high-profile projects elsewhere.

The Liberal Democrats argue that if Welsh Ministers held the full set of powers — not just operational control of services but authority over infrastructure and long-term funding — Wales could plan upgrades around Welsh needs, rather than waiting for decisions that must fit UK priorities.

What the Railways Bill changes

The Railways Bill is intended to reshape the way Britain’s railways are run, with the creation of Great British Railways and a new model for rail governance.

The Liberal Democrats claim the reforms risk entrenching central control and leaving Wales in a weaker position — locked into a system where Welsh institutions are “consulted” but not in charge.

The party is urging Welsh Labour MPs to back the amendment, framing it as a straightforward equality issue: Wales should have what Scotland has, and not be asked to settle for less.

The Government’s likely response

Ministers are expected to argue that rail infrastructure operates as part of an integrated network and that a UK-level approach can provide stability, economies of scale and coordinated planning.

There is also a money-and-risk debate at the heart of rail devolution. Full control of infrastructure would mean full responsibility for maintenance, renewals and long-term liabilities — and critics warn that if devolution is not matched with a guaranteed and fair funding settlement, Wales could inherit responsibility without the resources to meet it.

Some Westminster voices have historically warned against a “keys but not the fuel” scenario — where Wales gains power on paper but is left with difficult choices if costs rise faster than the funding formula.

Supporters of devolution counter that the current system already exposes Wales to risk — the risk of being outvoted, overlooked, or structurally underfunded — and that true accountability requires the power to make and fund decisions at home.

Welsh Government stance

Welsh ministers have repeatedly argued that rail infrastructure should be devolved so that planning, investment and services can be aligned with Welsh transport priorities, including decarbonisation and better integration between rail and bus networks.

The Welsh Government’s case is that Wales can only fully deliver a joined-up transport strategy if it holds the whole system — not just the passenger contract but the infrastructure control needed to shape outcomes.

Whether the UK Government is prepared to go that far remains uncertain, particularly if ministers believe the Bill’s reforms are designed to strengthen national coordination.

The numbers and the politics

The Liberal Democrats have 72 MPs, but would need support from other parties — including Welsh Labour MPs — to have any realistic chance of forcing a change if the amendment is selected for a vote.

That sets up a politically awkward test for Labour MPs in Wales, caught between party discipline at Westminster and growing pressure to demonstrate that Wales will not be treated as a junior partner when national infrastructure decisions are made.

For Welsh Labour, the question is whether to back a clear-cut devolution demand — or to argue that the Government’s reforms will deliver benefits for Wales through new structures, improved coordination and a different approach to investment.

If it passes — and if it fails

If the amendment succeeded, the next battle would be over the detail: the funding formula, the transfer of assets and liabilities, and the timetable for transition. Supporters would see it as a step towards a rail system planned around Welsh priorities — including rural and coastal routes too often seen as an afterthought.

If it fails, the Liberal Democrats are likely to use the vote to sharpen their wider argument: that Wales is still being asked to accept second-tier powers — and that rail remains a symbol of a devolution settlement that does not yet match the reality of Welsh nationhood.

Either way, the amendment has ensured one thing: the Railways Bill will not pass quietly in Wales.