A bi-directional shuttle (10) includes: (i) a support platform (14) for supporting goods thereon; (ii) a carriage (12); (iii) at least two primary wheels (22) rotatably connected to the carriage; (iv) at least two secondary wheels (24) fixed against displacement relative to the support platform; the axes of rotation of the secondary wheels being perpendicular to the axes of rotation of the primary wheels; (v) a link (16) that is pivotally connected to the carriage about a link pivot axis, and that includes a bearing surface (30) that is spaced from the link pivot axis; and (vi) a limiter (32) that limits displacement of the bearing surface away from the support platform. When: (a) the primary wheels protrude further from the support platform than the secondary wheels, angular displacement of the link about the pivot axis causes the support platform operatively to be raised or lowered: and (b) the secondary wheels protrude further from the support platform than the primary wheels, angular displacement of the link about the link pivot axis causes the carriage operatively to be raised or lowered.