I've used this here:
MB short 3-lane yard right,<kuid2:35412:40022:1> all by mike10
MB 3-lane yard left,<kuid2:35412:40018:1>
MB 3-lane yard right,<kuid2:35412:40020:1>
MB 6-lane yard left,<kuid2:35412:40016:1>
MB 6-lane yard right,<kuid2:35412:40017:1>
I don't connect the track to them, but instead lay my own track over them as I use them for templates. Once my track is in place, I then delete the fixed track object. If I want a dual-ended yard, as opposed to a stub-ended yard, I will lay the track at on end and flip the guide around for the other direction, adding tracks in between to whatever length I need.
A similar guide here by beadyboy is useful as well. This has a bit wider spacing and more tracks. I lay the track and place the splines at the spaces. The switches are tight together, but they are in a yard anyway.
CS Yard Template 1,<kuid:37522:9972> by beadyboy
It takes a little practice, but once you do it a couple of times, you'll find you get the hang of it pretty fast.
John