This essential part of Birdstone Terminal was a constant source of trouble, until Jerry worked his magic with some modifications.
So far, after six days of more-or-less constant repeated use, it's been 100% reliable.
As far as I know, the only commercial dbl xover that gets really good reviews is the Kato UniTrack... but it's only available in N scale.
Not all that great, but I couldn't find a nice kit I liked with a small enough footprint.
Razor-cut cardstock superstructure, soldered ladder, guards, & railing, and 'spagett-gumi' (rubber string).
The top 'vaccuum house' and storage bunker is part of a discarded plastic toy.
Don't ask me how it all works... I just took a guess on accuracy.
Sheet metal fence
Sections of Shapiro's 'security'.
Cardstock, basswood, and corrugated-formed tinfoil glued to cardstock.
Shapiro's had a few short sections like this... all rusty and dilapidated.
The tall vertical piece in the second photo isn't attached yet.