The National Union of Rail, Maritime and Transport Workers has called for a levy on the record profits reported by Britain's rolling stock companies, arguing that returns earned from leasing trains to franchised operators should be redirected into the railway.

The RMT's demand targets the three major rolling stock leasing companies — Angel Trains, Eversholt Rail and Porterbrook — which own and lease the bulk of Britain's passenger fleet. The union says their profits have reached record levels at a time when the industry faces continued pressure on costs, fares and public funding.

Under the current structure, train operating companies lease their fleets from the ROSCOs, with lease payments flowing through franchise contracts ultimately backed by public money. The RMT argues that this arrangement delivers guaranteed returns to the private lessors regardless of operator performance, and that a levy on those profits would recover value for the taxpayer and the passenger.

The union has pressed its case repeatedly as the structure of the industry comes under review. With the government moving to transfer franchised operations into public ownership as contracts expire, the status of the rolling stock market has become a live question in wider debates over how the railway is financed and who captures the returns it generates.

ROSCOs have historically defended their model on the grounds that they carry the capital cost of fleet investment, financing new trains and maintaining existing stock, and that their returns reflect the risks and long asset lives involved. Lease charges, they argue, give operators access to fleets without bearing the full upfront cost of ownership.

The RMT rejects that framing, contending that the lessors operate with limited risk because their income is effectively underwritten through the franchising system. Record profits, the union says, demonstrate that the balance between private reward and public contribution has tilted too far, and a levy is the appropriate corrective.

The financial scale at stake is significant. Rolling stock leasing represents one of the largest single cost lines in train operators' accounts, and any levy imposed on lessor profits would transfer revenue that currently accrues to shareholders — including infrastructure funds and other institutional investors — into the public purse or into fare and investment decisions.

For passengers and operators, the outcome of this argument matters in direct terms. A levy could reduce the net cost of the railway to government, fund fleet renewal, or support fare restraint. Alternatively, the lessors may argue, it could raise their cost of capital and slow the pace at which they order new trains from manufacturers such as Alstom, Hitachi and Siemens Mobility, with consequences for UK rolling stock supply chains.

The RMT's call adds to a broader set of questions about the future shape of the industry as public ownership of train operations proceeds. Whether rolling stock ownership and leasing remain on their current commercial footing, or move toward greater public control or taxation, will shape both the cost base of the railway and the investment pipeline for years to come.

No levy proposal has yet been adopted by government, and the ROSCOs have not publicly accepted the union's characterisation of their returns. The RMT has said it will continue to campaign on the issue as industry reform legislation progresses through Parliament.