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| Bristol Temple Meads - missing routes 16/12/2011 at 03:09 #25632 | |
maxand
1637 posts |
For fellow-newbies only. Why is it that I cannot seem to be able to set these routes (in Bristol, Modern Era): from 345/347 to 18? from 22 to 30/32? from 91/53/51 to 61? from 265, but not from 65, to 324/326?  I have to admit it had me tricked for a while. Answer here PS try not to read the following posts till you've tried it yourself, 'twill spoil the fun... x Last edited: 16/12/2011 at 05:06 by maxand Log in to reply |
| Re: Bristol Temple Meads - missing routes 16/12/2011 at 03:23 #25636 | |
jc92
3630 posts |
from 345/347 to 18? from 22 to 30/32? from 91/53/51 to 61? from 265, but not from 65, to 324/326? you cant get from one to another as theres no physically accessable route those arent points,they are crossovers edit: i understand what your getting at now, try putting it the manual rather than a post that will eventually get buried "We don't stop camborne wednesdays" Last edited: 16/12/2011 at 03:28 by jc92 Log in to reply The following user said thank you: maxand |
| Re: Bristol Temple Meads - missing routes 16/12/2011 at 03:31 #25637 | |
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UKTrainMan
1803 posts |
What you so eloquently describe as a "Crossover" is more commonly known as a Diamond Junction or Diamond Crossing. There is some further information available on this Wikipedia article.
Any views and / or opinions expressed by myself are from me personally and do not represent those of any company I either work for or am a consultant for. Log in to reply The following user said thank you: maxand |
| Re: Bristol Temple Meads - missing routes 16/12/2011 at 04:55 #25643 | |
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maxand
1637 posts |
Quote:What you so eloquently describe as a "Crossover" is more commonly known as a Diamond Junction or Diamond Crossing.I guess you're right. Now I think about it, crossover means from Up line to Down line or vice versa. Will amend second pic (done) and add to Wiki (done) See Crossover PS Flat crossing seems to be another synonym for Diamond Junction. Last edited: 16/12/2011 at 06:23 by maxand Log in to reply |
| Re: Bristol Temple Meads - missing routes 16/12/2011 at 06:52 #25644 | |
Peter Bennet
5360 posts |
In addition you can also have switched diamonds, that has the same effect as a diamond crossing but it consists of two points back to back which "switch" in unison. Examples can be seen at say Haywood Road and Hawkridge Jns on Westbury. Presumably there is a good reason why one form is preferred over the other in specific circumstances. I don't think Flat Crossing is quite the same thing as a Diamond Crossing in that Newark on the ECML has two independent lines crossing at 90 degrees(ish) on the level rather whereas a diamond is part of a junction complex. Might just be Terms of Art though. Peter I identify as half man half biscuit - crumbs! Last edited: 16/12/2011 at 06:58 by Peter Bennet Log in to reply |
| Re: Bristol Temple Meads - missing routes 16/12/2011 at 07:07 #25645 | |
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Forest Pines
525 posts |
" said:In addition you can also have switched diamonds, that has the same effect as a diamond crossing but it consists of two points back to back which "switch" in unison. ... Presumably there is a good reason why one form is preferred over the other in specific circumstances.Essentially, it depends on the angle. The smaller the acute angle between the two tracks, the longer the flangeway gap at the obtuse-angle crossings (I think they're called "K-crossings"  in the middle of the diamond; and the longer the flangeway gap, the greater the risk that a wheelset will jump from one track to the other and cause a derailment. So, particularly long K-crossings will have switches installed to remove the gap.Quote: I always took "Flat Crossing" to be the place by routes cross, rather than individual tracks within a formation. Of course they're rare in the UK anyway (apart from the ECML having three between London and Newcastle). Log in to reply |
