I've done some jottings that are in the attachment here and I tend to agree that 4 aspect on the main line would be necessary and even at minimum braking, you only deliver 100s so any variation does eat into your contingency.
For stopping calcs, I've employed the "how much time does a stop add into your front train" approach. ie take your NS headway and add time for deceleration, acceleration and dwell and see what you get, using line speed for all of this (assuming your fast is bearing down on you like that) but then converting the distances to time using headway speed to give a worst case (discuss!) you get 230s.
I've not looked at the branch or the freight. I must admit, if the numbers were that tight when I was doing it, there is not much you can consider if the freight does not meet it!
[attachment=180][attachment=181][attachment=182]
Click on the thumbnails here to see the attachments.
For stopping calcs, I've employed the "how much time does a stop add into your front train" approach. ie take your NS headway and add time for deceleration, acceleration and dwell and see what you get, using line speed for all of this (assuming your fast is bearing down on you like that) but then converting the distances to time using headway speed to give a worst case (discuss!) you get 230s.
I've not looked at the branch or the freight. I must admit, if the numbers were that tight when I was doing it, there is not much you can consider if the freight does not meet it!
[attachment=180][attachment=181][attachment=182]
Click on the thumbnails here to see the attachments.