  We theoretically consider the upper critical magnetic field, perpendicular to
a conducting axis in a triplet quasi-one-dimensional superconductor. In
particular, we demonstrate that, at high magnetic fields, the orbital effects
against superconductivity in a magnetic field are reversible and, therefore,
superconductivity can restore. It is important that the above mentioned quantum
limit can be achieved in presumably triplet quasi-one-dimensional
superconductor Li$_{0.9}$Mo$_6$O$_{17}$ [J.-F. Mercure et al., Phys. Rev. Lett.
{\bf 108}, 187003 (2012)] at laboratory available pulsed magnetic fields of the
order of $H = 500-700 \ T$.
