A Merseyside train operator has launched a crackdown on anti-social behaviour in a bid to make journeys for more pleasant for passengers.
Merseyrail is playing recorded messages and flashing up warnings on digital screens in trains.
Guards are also being fitted with mini head cameras to catch offenders.
Merseyrail says it plans to take out private prosecutions after guards recorded more than 300 bylaw offences since February.
Offences including smoking, putting feet and shoes on seats and even singing too loudly.
Patrick Verwer, Managing Director of Merseyrail, said: "It may seem like a minor offence but putting feet on seats and smoking on trains is actually very annoying for a lot of passengers."