  In this work we show that Rashba-based topological superconductor nanowires,
where the spin-orbit coupling may change its sign, support three topological
phases protected by chiral symmetry. When a superconducting phase gradient is
applied over the interface of the two nontrivial phases, the Andreev spectrum
is qualitatively phase shifted by \pi compared to usual Majorana weak links.
The topological \pi-junction has the striking property of exhibiting maximum
supercurrent in the vicinity of vanishing phase difference. Qualitative
features of the junction are robust against disorder and magnetic fields
violating chiral symmetry. The studied system could be realized by local gating
of the wire or by an appropriate stacking of permanent magnets in synthetic
Rashba systems.
