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WARNING - SEXUAL CONTENT: The pair appear to be naked although one seems to have kept their shoes on for the inconspicuous quickie
The pair can be seen through the frosted window, although their faces are obscured, when their train stopped at the platform.
The kinky commuters are believed to be in the toilet of the Arriva Trains Wales service when their bodies were seen rubbing up on the glass.
Shocked passengers waiting at another platform at Cardiff Central Station were able to film the footage on their mobile phones as they watched in disbelief.