We consider the degenerate Einstein's Brownian motion model for the case when the time interval ($τ$) of particle Jumps before collision (free jumps) reciprocal to the number of particles per unit volume $u(x,t) > 0$ at the point of observation $x$ at time $t$. The parameter $0 < τ\leq C < \infty$, controls characteristic of the fluid "almost decreases" to $ 0 $ when $u \rightarrow \infty$. This degeneration leads to the localisation of the spread of particle propagation in the media. In our report we will present a structural condition of the time interval of free jumps - $τ$ and the frequency of these free jumps $φ$ as functions of $u$ which guarantees the finite speed of propagation of $u$.