It would really help if people would stop calling this &#x27;real-time&#x27;, just because it creates the illusion.<p>Real-time means: physical train slows down, communicates with all interested parties within a limited amount of time (for example: 20 milliseconds). Because of CAP, interested parties either show real-time update within 20 milliseconds, or display &#x27;missing data&#x27;, or sth. Generally, the latter situation is a failure condition (fails the RT condition).