A bridge that could allow trucks to cross over a railroad track instead of at grade. This would allow for a railroad track to be placed in a cut and have the bridge pass over it, or for earthen ramps to be constructed on either side of a railroad track and a bridge placed upon the ramps.
See attached diagram.
I have attempted to use the existing vehicle ramp for this, but it requires level ground to place, and does not accept being undermined.
The opposite is possible, but then, the larges excavators aren't capable of crawling under the tracks since they are higher than a retaining wall.
This is quite annoying, especially since bridges size is 6 tiles, and level crossing is 7, roads can't shares the same width.
Now that we have train bridges, I do honestly think that this game needs this, but limit the bridge width to 7 for visibility reasons and not allow any buildings to be built on them for balancing reasons.