This is some sort of board game based on the same Legend of Peachboy characters as the not-so-Super (at least in title) RPGs of the same name. It seems to have a lot of trains, and trains are cool, so maybe this is too.
NOTE: All photos depict good condition items only; actual product may vary.
Used Super Momotaro Dentetsu II (good case, good instructions)
Used Super Momotaro Dentetsu II (good case, poor instructions)