  We study fluctuating tilt Brownian ratchets based on fractional subdiffusion
in sticky viscoelastic media characterized by a power law memory kernel. Unlike
the normal diffusion case the rectification effect vanishes in the
adiabatically slow modulation limit and optimizes in a driving frequency range.
It is shown also that anomalous rectification effect is maximal (stochastic
resonance effect) at optimal temperature and can exhibit a surprisingly good
quality. Moreover, subdiffusive current can flow in the counter-intuitive
direction upon a change of temperature or driving frequency. The dependence of
anomalous transport on load exhibits a remarkably simple universality.
