09-03-2009, 09:41 PM
(09-03-2009, 10:49 AM)alexgoei Wrote: Hello Peter
1 I have completed the G23 Activity Layout Calculation that is based on the 2004 layout. However my train separation for headway, Green to Red and N values are very different from those given in Appendix W, Activity 1B Headways and Braking Calculations. I would appreciate it if you can have a look at it.
2 For the same 2004 paper, I have computed the stopping requirement from C to Station D and from Junction B to Station D although for the latter I did it more out of practice and as an after thought after I did from C to Station D. I am glad to have done so as the Stopping requirement from the Junction B to Station D is the more onerous of the two. I have appended another file to show the graphs, the time taken and the distance covered.
3 Speeds for turnouts. So far in my computations for stopping requirements, I have used the same turnout speed for both normal and reverse movements. Or can I use the maximum permitted speed if the move through the point is facing, normal and trailing normal ie. Without any diverging movement.
Thank you for your comments and do look forward to your reply
Just got home after all day meeting at Derby, tomorrow is my last real day in office, then two days meeting in Madrid and then my last day of NR employment; hence may well not have time to look at attachments until weekend. May be that others may be able to respond sooner.....
However I can tell you that turnout speed applies for the divergence (both in facing and trailing direction) but not for the straight. Occasionally a turnout is actually made as a Y (with neither line straight) and in which case there is a speed restriction on both routes- generally equal speed. Similarly there can be curved turnouts where there is a shallow curve and a sharper curve of the same direction and for which there are separate speed restrictions. However the general answer to your question is YES.
PJW