  As smaller analogs of Active Galactic Nuclei (AGN), X-ray Binaries (XRBs) are
also capable of launching jets that accelerate particles to high energies. In
this work, we reexamine XRB jets as potential sources of high-energy cosmic
rays (CRs) and explore whether they could provide a significant second Galactic
component to the CR spectrum. In the most intriguing scenario, XRB-CRs could
dominate the observed spectrum above the so-called "knee" feature at $\sim 3
\times 10^{15}$ eV, offering an explanation for several key issues in this
transition zone from Galactic to extragalactic CRs. We discuss how such a
scenario could be probed in the near future via multi-messenger observations of
XRB jets, as well as diffuse Galactic neutrino flux measurements.
