Of course, nobody should speculate.

But there are some interesting features on the image you linked, beyond the Mag-Lev track. That "track" may well turn out to be the surface expression not of a ring but of a very close sub-satellite of some size. That satellite may have raised an equatorial ridge before it crashed to the surface. The large crater north of the ridge may be the remnant of that collision. There are other examples of ridges caused by tidal/gravitational effects on satellites, particularly at Europa, where the tidal effect of Jupiter itself causes (apparently) daily arcing three-part ridges across the satellite. http://photojournal.jpl.nasa.gov/jpegMod/PIA01641_modest.jpg

You'll note linear trenches which cross the ridge to the right of the view. These trenches appear to be related to the crater, somewhat like rays. The "landslide" on the margin of the large basin to the right may be related to whatever process created the trenches. Indeed, it could be spoil from the creation of the crater first mentioned.

The basin may not be an impact feature. It's not clear that it has a northern escarpment, and it may be a collapse feature, something that happened as the body adjusted to collision and perhaps the gravitational effects of a very close sub-satellite.

At any event, the equatorial ridge must be very old, comparatively speaking, in order for it to be cratered itself, and in order for what appear to be the effects of later massive collisions crossing the ridge to be visible. In other words, the ridge appears to predate much of the present surface.

I wonder how a relatively large body in an equatorial elliptical orbit would affect the surface...