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You can use dual, and quad, track, as a track spacing guide, for straights only, and use single track in the curves ... if you use multi-track in curves, it deforms the straights ... I always swap out the straights, to single track, on the end product route, as multi-track is total junky looking.
It was my understanding that when track is put down, the "direction" of the track is based upon the start to end point. By laying multi-track, all tracks go in the same direction. So, if you put down dual track with the intention of them being opposite direction, you'll have to include some direction markers. I think it could cause AI "decision problems" if you forget to use direction markers.
Also being bridges, crossovers can't be placed.
John - I'm sorry to disagree with you but I have found that on viaducts which I have made, if for example three lengths are used, it is possible to use the spline points joining the two outer ones to that in between to create crossovers - admittedly with a little care. I haven't done it recently but I found that by laying track from each of the two spline points to ground level, joining them and then deleting the spline point where they join, pointwork is formed. I'm sure I have also done this with lengths of double track laid at ground level.
Having said that I too would normally only use single track, correctly spaced by using one of my way gauges, spaced at 3,5 metres(UK standard).
Ray
Thank you for the correction.According to the official word from N3V Brew Crew, this is false...
I note that you say that crossovers cant be done with multi track. I don't know if I misunderstand what you mean but I have actually made dual track crossovers, complete with 'trigger multiple signal' rule, with no problems they all worked fine.According to the official word from N3V Brew Crew, this is false. However, track direction does affect the placement of trackside objects such as signals and speed limit signs, which makes placing them awkward because they have to be constantly rotated.
The biggest thing with the multiple-track objects is they are not really track. Instead they are treated like bridges so they can't be replaced using the replace assets tool. Also being bridges, crossovers can't be placed. In order to do this, small sections of single track are needed where the crossovers are.
Laying multiple track using single track takes a bit of practice, but there are track spacer objects, and even as Cascaderailroad said, using small bit of dual track as a guide then replacing it later with the single track as well. After this has been done for some time, you then get the hang of the spacing anyway, and no guide is needed.
John
I note that you say that crossovers cant be done with multi track. I don't know if I misunderstand what you mean but I have actually made dual track crossovers, complete with 'trigger multiple signal' rule, with no problems they all worked fine.
My apologies John. I completely misunderstood what you meant. I was thinking in terms of twin tracks crossing each other (as in a crossroads). I see now what you really meant.I should have been a bit clearer as it appears you are not the only one I confused, which isn't surprising as I confuse myself all the time!
What I should have said is using the dual track to make crossovers isn't possible or it doesn't work because the track will not attach to spline points made in the middle of its length, and only single track will do that properly.
I hope I didn't confuse you this time.
John
My apologies John. I completely misunderstood what you meant. I was thinking in terms of twin tracks crossing each other (as in a crossroads). I see now what you really meant.
Bill