Was on a packed train today when a man became aggressive. We texted the BTP on 61016 and the BTP came within 3 minutes or so and took the man away. A kind rail worker who happened to be next to me told me about the number. I just said aggressive man in carriage x and they appeared soon after. I have now saved the number in my phone and encourage you to do the same. It was great to be able to do it discreetly and for something to happen so quickly.