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I think crossings are one of the most intersting features on a railroad track.  Interesting is the difference in behavior and design when going from a medium angle crossing to a 90-degree crossing like in the photos.   In medium angle crossings, the ties are set to a compromise angle and then evolve back to normal as they leave the crossing.  With a 90-degree crossing, there can be no compromise, so one track has to sit lenthwise to specially enlarged ties as seen here.  I don't know what those would be called.  Also, with a 90-degree crossing the wheels have to jump the big gap of the opposing flangeway, whereas with medium angle crossings, the wheel encounters new support on one side as it leaves the old support of the opposite side.  So it does not need to jump off a cliff as it crosses the gap. I have noticed a lot of variety in the details of crossings. Probably the most interesting track features are puzzle switches, but that is another story.
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