In this case, I used the Jack London Square pedestrian bridge in Oakland as a Border.

Often, while shooting trains, one can use the branch of a tree or other vegitation, even a signal tower.

Even though the polarizing lens had darkened the blue sky, the palm frame set this scene in a warm climate, San Bernardino, CA.

The overpass above this Metrolink train departing San Bernardino, CA, made a nice top frame.  (Note the red lights indicating the rear of the train, not the front.)

To keep the viewer's eye from leaving the frame before reading "Boston and Maine," I bordered the shot with the platform overhang.

9.6

This border, at an abandoned sugar mill in Los Mochis, Mexico, was unavoidable, but I think it focuses the viewer's attention on the distant steam engine.

When shooting at a station, platform roofs make a good border to hide blah skies.  Fullerton Station with the Overland Trail and Salsbury Beach.

Signal tower makes a nice frame on a mountain curve.

The frame of the rail car, or in this case the front windshield of the motorcar on the Skunk Train Line, becomes a dark frame at the top of this shot showing an old useable water tower with vegetation using the leaking water.

The Pacific Surfliner looks good in morning light, but the dark palm tree and date/time sign help emphazize the main subject. If the upper right corner was also dark, as are the other 3 corners, the viewer might have noticed that the whole train is included in the photo.

Shooting from the cupola of a heated caboose, the handrail on the left and the top of the tank car ahead of us framed #93 and it's beautiful winter steam.  Dark corners are desirable in photos to keep the viewer's eye from drifting from the photo.  I succeeded here in keeping corners darker than the main white steam.  Cropping will help with the dark corners concept.

A shot out the opposite end of the caboose (above) than the one at the right, uses the stovepipe as a border for the scene.

There is an obvious leading line (track) and border (handrails on the caboose) in this shot, but I can hear a former photography instructor saying, "What is the main subject?"  I could weakly say, "The smoke shrouded Nevada Mountains."

Pedestrian overpass and palm trees frame this Metrolilnk in Fullerton.

This image makes better use of the ladder as a border (compared to the image above) because of a main subject. However, I like the light better in the image above...it's all choices if you take many images.

A signal tower in Fullerton, CA, borders the image of an oncoming Pacific Surfliner.

The platform overhang makes enough of a border to force the eye to "Metrolink" the subject of this photo shoot at the San Bernardino Station.

LA Union Station's platform roof aligns perfectly with the top of a Surfliner as a frame.

The Sacramento platform  roof and bench completely frame Amtrak California Engine 2007.

The last coach car's view down the tracks is truly a 'bordered image.'

Fullerton Station's palm trees frame a private caboose and the Overland Trail.