A couple of years ago I was working on missing joint bar bolts and concentrated on the main line outside of the SS yard limits. I got that project down to about 15 locations north of the SS yard limits.
At that time there were a whole bunch of missing bolts in the SS yard, most being south of the water tower switch. Since the yard limit speed is 10 mph, we only need three bolts per joint bar. I suspect Joe, who is doing a great job trying to keep our rails aligned and clean up a few old projects, found an issue that needed prompt repair.