I’m not a fan of heights, but in order to capture the desired look and feel, I had to suck it up and climb out to the edge of a train tunnel along the Columbia Gorge, skew the camera  to incorporate the sky in order to bring balance to the composition due to the lightness of the water on the left and the weightiness of the cliff face on the right of the composition. Then I waited and prayed for a westbound train to appear before the sun completely set.  Sometimes prayers are answered. The illuminated portal was achieved by allowing the head and ditch lights of the locomotive to burn in the frame before it vanished into the tunnel.  Moments later the sun did likewise, though not into the tunnel.