Yes, a section of missing track can sneak in sometimes during route-building and can be easy for the Developer to miss. And in cases like this, the track still seems to work fine, just it's missing that part of the rail visually. I remember, after releasing my King's Arm Highway route, someone brought to my attention there was a bit of missing track like this which I had somehow missed (and the track and the route still worked fine as it was regardless).
But if it's not that, then there used to be the problem (or it could still be an issue) of ATI graphic-cards sometimes causing graphic oddities such as some bits and pieces might disappear on some objects / trains and such if the Adaptive Anti-Aliasing option was on in the graphics-control-panel.
PS: You're probably going nuts anyways.

Join the nutty club along with me.