Using the same technique, finished the second abutment for the Atlas O bridge. This one has a tunnel portal thru it, an unfortunate but necessary compromise required by the small layout. The track on both levels needed to be close to that wall... the lower to make a full U-turn in O-54, and the double-track upper to make a sweeping "S" turn in O-72 / O-81. But, on the spectrum of suspending disbelief, it still ranks lower than a tunnel with both ends on the same side of the mountain. And it will be mostly not visible anyway - in the shadow of the bridge and screened by foreground structures.
