ELI5: Explain Like I'm 5

Slovak rail border crossings

So, let's say you want to go on a train ride from Slovakia to a neighboring country like Hungary or Poland. When the train gets to the border between Slovakia and the other country, it has to stop and go through a special process called a border crossing.

At the border crossing, people who are traveling across the border have to show special documents, like a passport, to prove that they are allowed to be in the other country. The train conductor and border patrol officers work together to make sure that everyone who is crossing the border has the right paperwork.

Once everyone has been checked and approved, the train can continue on its journey into the other country. So, a Slovak rail border crossing is just the process that happens when a train crosses from Slovakia into another country and has to go through a special check to make sure everyone has the right paperwork to go there.