Barry is among the areas to face increased delays, with 166 separate flooding incidents recorded since 2014.
This is part of a wider trend across the Wales rail network, with Machynlleth experiencing the highest number of incidents at 1,112.
Other affected locations include Cardiff Central (1,003), Bridgend (979), Bangor in Gwynedd (753), and Pontyclun (642).
Gemma Plumb, a meteorologist at Weather Change, said: “It’s clear that train users are seeing more and more disruption to their journeys as a result of heavy rain and flooding, which is hugely frustrating for people who rely on the train network to get around.”
The disruption reflects a broader UK-wide pattern.
Data shows that flood-related delays now cause about 30 more minutes of passenger delay per million journeys than a decade ago.
The Met Office reports the decade from 2015 to 2024 was two per cent wetter than 1991 to 2020, and 10 per cent wetter than 1961 to 1990.
The UK’s Climate Change Committee has warned that the country is not prepared for the impacts of climate change.
