MDRails: locomotive

If your train pictures are coming out with blurry locomotive railings, your shutter speed is too slow. Though a locomotive's handrails are sturdy enough to protect a worker, they do tend to vibrate, even at slow speeds.
Casual/new railroad photographers can fix this by using the shutter-priority* camera mode, which allows you to change the shutter speed, while the camera adjusts all the other settings automatically. Try 1/500 second for starters. If your camera doesn't have a shutter-proiority mode, try sports-mode.
You can always sharpen the thing in Photoshop, but that'll only get you so far before things start to look weird - better to get it right to begin with.

*Shutter priority is often abbreviated as S (with Nikon, Minolta, Konica Minolta, Sony, Olympus, Sigma) or Tv (for "time value" with Canon, Pentax, Leica) on a camera mode dial. (Wikipedia)