Sydney's metropolitan transport network was inundated by more than 190 officers over the weekend, as part of an operation targeting crime in transport hotspots.
Operation Colossus was conducted on Saturday.
It involved officers from Police Transport and Public Safety Command and targeted all modes of transport.
It extended as far as Newcastle in the north, west past Penrith and down to Wollongong.
The operation focused on improving safety across the public transport network to reduce alcohol and drug-related crime, anti-social behaviour and graffiti/malicious damage offences.
During the operation, officers made 31 arrests for a range of offences, including assault, possession/supply of prohibited drugs or weapons, outstanding warrants and traffic infringements.
Officers searched a total of 147 people, issued 145 move-on directions, and 405 infringement notices for a range of offences.
Acting Commander of Police Transport and Public Safety Command South-West, Acting Superintendent Sheridan Waldau, said operations on public transport play an important part in community safety.
"These high-visibility police operations on public transport go a long way in making our streets and transport networks safer, especially when we are able to locate and seize numerous knives and drugs and execute outstanding warrants.
"The public can expect similar operations to continue to occur later in the year in an effort to reduce crime and increase public safety on and around public transport."