Jorge R. Frank wrote:

Right. And as others have stated, Zvezda can interconnect to a docked
Progress on either port to reboost the station even if Zvezda's own engines
are inop. (And even if there is no Progress docked, don't forget that only
one Zvezda engine failed; they can still do single-engine burns if they
must.)



Looking at my Intermountain Railways model of the ISS, it looks like
Zvezda has a total of three open docking ports; the one facing toward
the rear of the station flanked by the two engines they are trying to
use, and two mounted to the "docking sphere" that are at ninety degrees
to the main axis of the station (up and down).
How's the Progress supposed to get its center of thrust to pass through
the ISS' center of mass from either of those two locations?

Pat