Irish Rail received reports of the use of cocaine, ketamine and other drugs on trains last year.
They're among 277 anti-social behaviour complaints the company received in 2021.
Irish Rail got 258 complaints of antisocial behaviour in 2020 - rising to 277 last year.
Irish Rail says it works extensively with other agencies, including the gardai, to combat antisocial behaviour on trains.
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Love Songs on the Coast
Sunny intervals
High: 15°C | Low: 12°C
Sunny intervals
High: 14°C | Low: 12°C
Sunny intervals
High: 14°C | Low: 10°C
Sunny intervals
High: 14°C | Low: 10°C
Sunny intervals
High: 14°C | Low: 9°C