I learned as a child as I am sure many of us did that one must be careful crossing railroad tracks that intersect the road on an angle. The more of an angle the more dangerous the situation is. This is especially true for a bicycle than it is for a tadpole trike yet even a tadpole trike can be susceptible to the possibility of a wheel going down into the tracks and causing a wreck. It is always safest for a narrow width wheel vehicle to cross over railroad tracks at as close to a perpendicular (90 degree) angle as possible.
This is to prevent a wheel from getting caught in the railroad tracks and causing a wreck. Depending upon the width of the road the rider may have to ride over into the oncoming traffic lane to make this maneuver so be sure the way is clear ahead and behind.
Although the video below is about bicycles it illustrates what I am talking about including a wheel getting caught and causing a wreck. Fortunately the rider saved the situation and managed to avoid going completely down.
As a child I learned what can happen. I had the same experience as the bicyclist in the picture above did. Fortunately I didn’t get injured but it taught me how important it is to cross tracks safely. I might mention that the worse the pavement is at the train tracks the more dangerous the crossing is. Be safe out there so that you can …
KEEP ON TRIKIN’
A FREE GIFT awaits you!
Tadpole Rider 
Very good reminder Steve. Thanks for pointing it out!
A similar problem is entering a driveway. If the entrance to the driveway has a large lip and you hit it at an angle, your wheel can lock into the lip and not exit. Best to enter driveways at as close to 90 degrees as possible – especially for as 2 wheel.