  The compound $Nb_{5-\delta}Te_4$ ($\delta=0.23$) with quasi-one-dimensional
crystal structure undergoes a transition to superconductivity at $T_c$=0.6--0.9
K. Its electronic transport properties in the normal state are studied in the
temperature range 1.3--270 K and in magnetic fields up to 11 T. The temperature
variation of the resistivity is weak ($<2%$) in the investigated temperature
range. Nonmonotonic behavior of the resistivity is observed which is
characterized by two local maxima at $T\sim$2 K and $\sim$30 K. The temperature
dependence of the resistivity is interpreted as an interplay of weak
localization, weak antilocalization, and electron-electron interaction effects
in the diffusion and the Cooper channel. The temperature dependence of the
dephasing time $\tau_\phi$ extracted from the magnetoresistance data is
determined by the electron-phonon interaction. The saturation of $\tau_\phi$ in
the low-temperature limit correlates with $T_c$ of the individual crystal and
is ascribed to the scattering on magnetic impurities.
