The British Transport Police in Wales did spot checks on a train to see if passengers were following firebreak lockdown rules.
Under the shutdown, which began at 6pm on Friday 23rd October and will end on 9th November, non-essential travel is banned.
A tweet from the Transport Police in North Wales sparked a backlash across social media.
Welsh police defended the spot check exercise on trains which was put in place to monitor ‘essential’ journeys
The force later tweeted “Wales is on lockdown. You should not be out without a reasonable excuse.
“It is our job to enforce the current regulations. We did this throughout the previous lockdown too.
“This means asking why people are travelling.”
The force added that everyone needs to do their bit to defeat the virus.