Though a Hi-Railer, I'm fond of 027-profile track in yards where sharper curves may be needed or permitted. (I also don't mind the tinplate bones showing, here and there).
I used this track back in the late 80's/early 90's for some yards; it's 042/027 profile.
The 3-ties don't matter as the track was buried anyway. Wasn't much choice back then.
I wish that there had been 072/027-profile curves; could be very handy in some layout areas. I do have some of the Marx 034 track "in inventory", but not on the layout.
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The photo below (my dirt has loosened over the last 25 years; my entire layout is an old mess - like me) shows Lionel 042 (left, bottom) mated with a GG switch.
