The name adhd is misleading... it's not a deficit of attention but a a deficit of being able to control where to put the attention.
(btw some adhd researchers from switzerland proposed to rename it to "Unusual Management of Informations and Functions")
The problem is that you assume this is a normal train behavior. It is not.
If your question is truly about the general efficency. here is the very first article that i found https://www.thegreenshot.io/uncategorized/train-vs-car/
But all your answers make it clear that you don't care about your question, instead you want to complain. And rightly so! This is shitty
Just stop fraiming it as if you are asking a question. It is not happening with well designed infratructure and is not a general problem with trains.
Maybe in your specific place it might even has a net negative impact. But almost everywhere else trains are saving tons of fuel.