Earlier i heard a report from a friend that there was a SU100 that had to reverse after it had stopped to not block a crossing. As for the WS3 part possibly the SU100 crew outlawed and the WS3 crew took over for the rest of the journey. Thats all i know of.
A note about the SU100 in the locomotive consist it has an ex Guilford unit in it. So look for this unit to head west on the SU99 tonight unless it is cut out for local service.