Yep, getting this fairly often, along with random teleports and general lag.

This has just started happening to me in the last few days. I've never associated it with the train tracks though. Once it happened at Balota air strip in the same manner as described above - it froze and I had to alt-f4. Sometimes, however, it teleports me and doesn't freeze, I just land somewhere nearby, although the distance seems to vary between 10m and 500m.