Labour will today pledge to renationalise railways across the UK within five years of taking power at Westminster.
Louise Haigh, the Shadow Transport Secretary, will set out a detailed blueprint on how services will be brought back under public ownership.
Great British Railways will be established to take over the running of lines as contracts with private firms expire.
The ambitious plan would see all cross-border services linking Scotland with England brought back under public control.
ScotRail, which runs the vast majority of passenger services north of the Border, was previously nationalised by the Scottish Government in 2022.
Labour will also vow to put passengers first with a best-price ticket guarantee, automatic money back if services are delayed and digital season tickets across the network.
It is hoped that it will deliver significant savings for the taxpayer by eliminating fragmentation and bringing to an end bumper profits for private firms.
Speaking ahead of the announcement, Haigh said: "Labour will deliver the biggest overhaul to our railways in a generation. Whilst the Conservatives are content to let Britain’s broken railways fail passengers, Labour will deliver root and branch reform.
"After years of dysfunction and waste our broken railways are unfit to meet the needs of modern Britain. Passengers and taxpayers alike are being failed, and our economy is being held back. Doing nothing is simply not an option.”
Keir Starmer previously said he would take a "pragmatic" not "ideological" approach to nationalisation if he entered Downing Street.
Many Labour members have called for the party to bring sectors of the economy back under public control, such as energy.
But Starmer stressed rail was "different" as so much of it was already publicly owned.
Network Rail - which owns and maintains railway infrastructure - is already in the hands of the UK Government and funded by the taxpayer
Mick Whelan, general secretary of train drivers' union ASLEF, today hailed Labour's pledge.
"We have seen more positivity in this stunning Labour vision for rail than anything from the Tories during all the years of the failed privatisation of our industry and their subsequent rail reform programme," he said.
"The Labour commitment delivers for the economy, for the taxpayer, for passengers, and for staff.
"ScotRail, has already been taken back into public ownership by the Scottish Government. This has brought clear benefits in Scotland, with better industrial relations and the pilot to scrap peak fares both being a direct result of public ownership.
"We welcome the Labour reaffirming that it will bring our railways - including cross border services that will benefit passengers in Scotland as well as the rest of the UK - back into the public sector where they belong.
"Even Margaret Thatcher famously said that privatising British Rail was 'a privatisation too far' and so it has proved."
Alex Rowley, Scottish Labour transport spokesman, said: "These bold plans will renew rail services in Scotland and across the UK.
"The Tories have presided over a broken privatised rail system that is failing passengers and holding back our economy while the SNP has squandered the opportunities created by public ownership here in Scotland.
"Passengers in Scotland and across the UK deserve better than unreliable services, extortionate fares and Victorian infrastructure.
"Labour will deliver the change our railways need with a new publicly-owned GB rail company which will work hand-in-hand with a publicly-owned devolved ScotRail.
"Labour’s detailed plans will get our railways back on track and raise standards for passengers, drive growth across Scotland, and cut emissions.”
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Andy Bagnall, chief executive of rail industry lobbying group Rail Partners, said: "Train companies agree that change is needed for the railways, but nationalisation is a political rather than a practical solution which will increase costs over time.
"Creating a thriving railway for customers and taxpayers does not have to be an ideological choice between a monopoly railway in public hands and one that delivers private investment and innovation through franchising.
‘"There is an alternative plan which gives the best of both worlds and is already being used by Labour Mayors and increasingly across Europe."
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