I've tried to activate with redstone, put the train in the platform where can reach the place or far away from the platform, also tried to place in the train sensor adjacent to, but can not activate it, please ask how I should use it?

Please place it under the rail.(****)

Please place it under the rail.(****)

Thanks for answer. I found it could not work because I am not on the train. It's my problem.

I have a few more suggestions. I hope I can simulate the effect of East Rail trains avoiding the through train from mainland China to Hung Hom. Can I add an overtaking route in the future?

Finally, I have a little problem, where are you from? :P