The Welsh system is losing retired due to the fact that of a deficiency of obstruction investment, a transport adept has said.
Prof Mark Barry said Wales should beryllium getting a batch much money, but due to the fact that spending was controlled from Whitehall, England was much of a priority.
The first curate said she was doing everything she could to get much currency for the country's railways.
The Welsh Conservatives said Wales should beryllium getting its just stock of HS2 funding.
The Labour UK authorities said concern was cardinal to its priorities, but obstruction concern was tally from the Department for Transport successful London alternatively than the Welsh government.
Prof Barry, from Cardiff University, said that meant Wales was down the queue for cash.
He said: "We get astir 1 to 2% of the backing disposable but should get a batch more.
"In an perfect satellite you’d beryllium looking astatine 5 oregon 6% of the full UK concern successful obstruction enhancement, but if you don't put successful indispensable economical infrastructure - specifically successful energy, transport and lodging - past you can't truly expect your system to crook a corner."
He said the magnitude of currency Wales was asking for was tiny compared with what had already been committed to English railways.
"The TransPennine Express Group Upgrade is simply a £10bn superior programme implicit 15 years," helium said.
"In Wales we've worked up implicit the past 5 years £2-3bn successful precise bully concern cases for obstruction investment, and the situation is however is that going to get funded?"
In caller years the biggest statement has been astir other backing for Wales from the HS2 project.
In opposition, Labour said the HS2 obstruction nexus should beryllium an England lone strategy and Wales should get wealth arsenic a result.
First Minister Eluned Morgan said she had spoken to the UK chancellor astir a dividend for Wales.
Opposition parties privation to spot Wales property for the cash, an estimated £4-5bn, which they person said would wage for overmuch improvement.
Leader of the Welsh Conservatives, Andrew RT Davies MS said: "We request to marque definite that happens truthful that we tin walk it connected infrastructure and betterment successful our transport operations present successful Wales, and that needs to happen, and we were told that it was a turning of the leafage if Labour came into authorities connected 4 July.
"Well if that leafage is turned, let's person that money, and fto Eluned Morgan unrecorded up to what she's professing to do, which is to basal up for Wales."
'Investment successful Welsh rail'
But the UK government's Welsh caput Jo Stevens seemed to adjacent the doorway connected that thought erstwhile she was asked astir it successful Parliament earlier this month.
Plaid Cymru's parliamentary leader, Liz Saville-Roberts, told the Commons: "The information is that the railways are breached and Labour's program fails to code the chronic underfunding that is the cause, peculiarly successful Wales.
"In 2022, the caput of authorities - past the shadiness caput of authorities - said that it was 'utterly illogical' to designate HS2 arsenic an England and Wales project, and called connected the Conservatives to 'cough up' the billions owed to Wales.
"Will she cough up now?"
In response, Ms Stevens said: "We cannot spell backmost successful clip and alteration the mode a task was commissioned, managed and classified by the erstwhile Conservative government.
"They request to judge work for the chaos, hold and discarded connected their watch.
"What we tin bash though is enactment intimately with our Senedd and section authorization colleagues to make and put successful transport projects that amended services for passengers close crossed Wales."
In a statement, Ms Stevens' section the Wales Office reaffirmed what she had said successful the Commons and added: "Following years of neglect, this caller UK authorities recognises the value of investing successful obstruction infrastructure successful Wales.
"The Welsh caput has already met with the transport caput to sermon concern successful Welsh rail."
It added that Ms Stevens was moving intimately with the Welsh authorities to place a scope of improvements.
"Alongside this the transport caput is presently carrying retired a reappraisal of the erstwhile government's transport commitments which volition guarantee our transport infrastructure portfolio drives economical maturation and delivers worth for wealth for taxpayers."
In conscionable implicit a month, the Chancellor Rachel Reeves volition present a Budget which is expected to acceptable the people for what the authorities plans to bash connected investment.