Would that be one that went through Wham Mine first? I have a feeling the tale by Steve Thompson on recovering the wagon mentioned something about cartgates, but I cannot find it now.
On the few trips I've been down Hazard, I was quite surprised to see that it didn't really correspond with the (admittedly diagrammatic|) section of the mine I'd seen, and the shaft and accessible passages seemed 'a bit wrong'. However, when we surveyed it, it seems that the shaft area is actually on a short N-S fault, as well as the main E-W one - as well as vertically! There's a really obviously displaced bedding about 60m down the shaft with about a metre difference between the two sides (image attached, which is a still from a GoPro video shot by Jim L) - but I didn't noticed any obvious cartgates heading off westwards around the depths they should exist at - though this area would be worth looking at further. All the veins seemed backfilled for much of the shaft depth on the west side. Also it seems the climbing shaft, now buried at surface, dropped into the North Vein, whilst the engine shaft was on the South Vein, and both ended up at different destinations westwards.
All the accessible stuff I saw seemed to go east, after negotiating the wrinkle where the shaft is. The passage with the wooden wagon in is (I think) a very large crosscut between the veins as it's heading almost north. The stope above the wagon passage may have a western continuation but I didn't get off the rope. Jim probably has more info on this than I do.