The classical geometrical construction of Bianchi-Lie, Backlund, and D
arboux transformations is considered and generalized for dynamical sys
tems. For a transformation that generalizes normal displacement, a cla
ss of dynamical systems that admit this transformation is found. A dif
ferential equation that distinguishes dynamical systems in R2 that bel
ong to this class is derived, and some solutions of it are considered.