In europe the infrastructure is run far more intensively than in the past, a 60 second delay at a station while someone holds the doors has a knock on at a busy

In europe the infrastructure is run far more intensively than in the past, a 60 second delay at a station while someone holds the doors has a knock on at a busy junction which leads to 20 minute delays 100 miles away for the next few hours, just like someone cutting in on an interstate can cause a brake wave causing delays an hour later 20 miles away. This intensiveness is to transport the largest number of people possible.