British Transport Police

Okay, so there are some special police officers in Britain who work only on trains, buses, and other kinds of transportation. They are called "British Transport Police" or "BTP" for short.

Their job is to make sure that people who are using public transportation are safe and following the rules. That means they are watching out for any dangerous behavior or things that could cause harm or trouble.

They also help people who need assistance, like if someone loses their wallet or needs medical help.

So basically, they are like normal police officers, but they work on public transportation to keep everyone safe and make sure things run smoothly.