Below is an example snapshot end message.
{ "$type": "Darwin4Trains.Entity.SnapshotEnd, Darwin4Trains.Entity, Version=1.0.258.3, Culture=neutral, PublicKeyToken=null", "TimeStamp": "2017-09-15T14:46:52.3008696", "NMSCorrelationID": "2ebf0a35-e4fa-45d2-9485-47d1553027da" }
The NMSCorrelationID will be the same as the NMSCorrelationID specified when requesting the snapshot.