The problem with hybrids is that battery technology currently does not allow for rapid recharging. Until that issue is resolved, long recharging times will limit the availability of battery locomotives.
Recharge ‘time’ is not an issue with these locomotives; existing cell chemistries currently tolerate comparatively short monitored charge to ~80% even in the absence of good heat monitoring and dissipation – and good heat dissipation ‘cell by cell’ is an essential part of any practical battery locomotive, hybrid or otherwise. Naturally this is complex, and presumes a much more difficult and potentially showstopping issue (the energy density of the charging system(s)) but at the size of a practical locomotive traction battery and design to tolerate the characteristics of “dynamic braking” regenerative storage, it is unlikely that charging time itself is on the critical path.