Rail company Transport for Wales has defended its on-board safety measures, following concerns over crowding on some trains during the recent good weather.

But the firm said social-distancing was "not always possible...on every service" and encouraged customers to use its online Capacity Checker tool before they travel.

One Senedd member said reports of passengers "being cramped like sardines" on trains was "of huge concern".

Welsh Conservative MS Natasha Asghar said the situation "needs to be urgently addressed" to ensure customer confidence in the safety of rail transport.

Her comments came after reports of trains being too full for passengers to follow government advice on staying two metres apart.

While Wales was at the highest levels of coronavirus alert, travel on public transport was limited to essential trips, but these measures have been relaxed in recent months.

The recent good weather has brought more passengers back to Welsh trains, and one traveller on the Barry to Cardiff service on Bank Holiday Monday (May 31) shared this photograph of a busy train, calling it "disgraceful" and "impossible" for people to follow social distancing rules.

A spokesman for Transport for Wales said the firm was "working hard to implement as many safety measures as possible, including putting every available carriage into service [and] ensuring people who can, wear face coverings".

Passengers should also use the company's Capacity Checker tool, which tells you how busy each train is likely to be.

The spokesman said Transport for Wales was "actively promoting" the tool so customers can plan ahead, not just for their initial journey but for the important trip home too".

The tool (see screenshot below) uses a colour-coded scheme to tell you how much space should be available on your chosen train at each stage of your journey.

The National Wales: Transport for Wales' Capacity Checker tool lets you find out in advance how busy your train is likely to be. Picture: TFWTransport for Wales' Capacity Checker tool lets you find out in advance how busy your train is likely to be. Picture: TFW

However, the tool should only be used as an indicator, and for some of the busiest routes in the warmest weather - such as Barry Island, Tenby and other seaside resorts - Transport for Wales said the Capacity Checker "may not reflect these seasonal fluctuations".

The rail firm also said it would arrange "additional services and road transport" if demand required it, and a new service from Cardiff to Holyhead would run using "improved and bigger trains".

There are also plans to add an extra 20 carriages to the Swansea-Manchester route, but this will not happen until 2022.