**4. Conclusions**

We provide evidence for the validity of the fluctuation–dissipation theorem and Onsager's reciprocal relations far from equilibrium at stalling configurations where *I*1 = 0. Additionally, we successfully tested the fluctuation relations for the third cumulant in which all the transport coefficients are calculated at stalling but far from equilibrium. The positive results are good news, as they confirm that there are indeed some situations in which a system driven far from equilibrium enjoys near-equilibrium properties, and can therefore be analyzed by means of the well-known theoretical models of equilibrium thermodynamics.

A possible extension to this work is to investigate the behavior of stalling currents and the validity of the non-equilibrium relations with transport coefficients at stalling configurations in cases where the system exhibits purely quantum effects, such as quantum transport under the preservation of phase coherence when higher-order tunneling effects are included.

**Author Contributions:** Formal analysis, R.L. and L.M.; Investigation, R.L. and L.M.; Methodology, R.L. and L.M.; Project administration, R.L.; Software, L.M.; Supervision, R.L.; Validation, R.L. and L.M.; Writing – original draft, R.L.; Writing – review and editing, R.L. and L.M.

**Funding:** L.M. acknowledges the SURF@IFISC program. We acknowledge the the MICINN Grant No. MAT2017-82639 for its financial support.

**Acknowledgments:** We thank David Sánchez for enriching our work with fruitful discussions and his useful remarks. Finally, we acknowledge the indirect help of Jong Soo Lim for providing some of his previous work, which helped in understanding some of the theoretical framework.

**Conflicts of Interest:** The authors declare no conflict of interest.
