Giant moving mud puddle tries to take out a TRAIN

Sorry, but that is not a mud puddle.  Mud puddles do not move.  If they do move, they become mud streams or mud rivers.   

The power of water is incredible.  To think of how water can tunnel under ground and destroy so many things so seemingly effortlessly is mind boggling.    

It seems that area is mostly soft dirt/sand.  It makes it easy for the water to move through and displace the soil.