{Couldn't find an existing relevant thread, if someone knows better...}
BBC News - Wales
From the general comments in the later part of the article, it would seem the real issue is lack of train coach capacity (ie carriages) rather than line capacity for more trains, or am I mis-understanding the problem?
BBC News - Wales
TfW travel: New rail line for major Cardiff events axed
A railway line aimed at improving travel after major events in Cardiff has been cancelled.
The Welsh government pulled the plug on the plan, saying it no longer offered value for money.
Transport for Wales (TfW) says it cannot get back £10m spent on preparing to build the track at a steelworks near Newport.
But Senedd opposition parties said public money had been lost on the project.
Under the plans, extra trains could have waited on the 1.6km-long line near the Llanwern steelworks when big crowds of fans were expected at venues such as the Principality Stadium.
It would have provided additional capacity, making transport run more smoothly.
In its latest annual report, TfW said the £10.54m spent on the project since 2018 was "now considered irrecoverable".
The company says other plans to open new commuter stations around Newport and Cardiff, including at Llanwern, will go ahead.
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Sarah Hemsley-Cole, who runs a Cardiff-based event production company, said the city had "really fragile transport infrastructure".
"There's always a great push on sustainability and I don't think we really have the solutions here in Wales to deliver a robust transport network to support the events that we have," she said.
Football fan Evan Powell, 20, of Cefn Hengoed, Caerphilly county, says, while delays on match days are inevitable, overcrowding is the biggest issue.
"The amount of times that a two-carriage train has turned up at a platform with hundreds of people waiting on… you're either getting refused to travel back or you're stuck in the most uncomfortable train ride that could be potentially dangerous," he said.
...continues..
From the general comments in the later part of the article, it would seem the real issue is lack of train coach capacity (ie carriages) rather than line capacity for more trains, or am I mis-understanding the problem?