I have a stash of Unitrack I'll be using for a shelf-type switching layout for my large-flanged AHM and Euro models.
Although the "snap together" feature of this track is fine, I wanted to see if something else would look better and reduce the "klickity klack" noise that seems to be a result of those joiners. I removed the Unijoiners and tried to come up with a decent substitute.
Although this track is rated at code 83, the rail "foot" is quite narrow, and I've found that Atlas N scale code 55 joiners fit perfectly. They are nice and snug, so they hold the pieces together well, and conduct electricity very well too. The gap left from the (now missing) plastic part of the Unijoiner is hardly noticeable, and in fact I think it looks better than the large, off-color original piece.
I took my most silent engine (not a Kato, but a Roundhouse RS3...go figure!) and ran a side-by side test with both the stock track and with the Atlas joiners. The track noise was indeed reduced, so all in all this little experiment turned out to be successful.
Again, I don't know if this will be of any interest, but I thought it was worth sharing...
Mark in Oregon