As of early 2026, all Transport for Wales (TfW) trains in the active fleet are equipped with onboard toilet facilities. This is part of a major multi-year fleet modernization project that saw the retirement of older "Pacer" trains, which famously lacked restrooms. In 2026, the fleet consists of modern Class 197 Caimans, Class 231 Flirts, and the new Class 398 tram-trains, all of which feature at least one universal accessible toilet (UAT) designed to accommodate passengers with reduced mobility and those traveling with small children (including baby-changing facilities). On longer-distance routes, such as those between Cardiff and Holyhead or Manchester, trains often have multiple toilets spread across different carriages. While TfW strives to ensure these facilities are operational on every journey, they occasionally close for maintenance or if the water tanks are empty. It is worth noting that while all trains have toilets, the replacement buses used during engineering works rarely do, so passengers are advised to use station facilities before boarding any bus-based alternative.