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...It could be based on the VRML/X3D standard and it could use internal scripting with ECMAScript and MU systems that provide network sensor interfaces.
Project Homepage: http://simulrr.sourceforge.net
The SRR Framework has been used by the SrrTrains v0.01 project
Demo 2012: https://www.youtube.com/watch?v=bHBwXmMfF1c
Home of SrrTrains: https://lc-soc-lc.at/host