I love grade crossings. This photo shows the crossing signals purchased from Shapeways, a new outlet of detail parts using 3D printers. The signals do not light up, but are very well detailed.
mike allred (AT&SF, WP)
$11.00 for the pair, including the gates. There are other versions to choose from, depending on the width of your road. Visit www.shapeways.com for this and loads of other detail items. You can also contract your own plans.