TCNOpen goals are linked to the development projects currently in progress.

At the moment, there is one active project, started at the beginning of 2012 with the scope to develop a first open source implementation of the TRDP (Train Real-time Data Protocol) module.
A description of the TRDP module can be found here.

The standard specifying such module is IEC-61375-2-3 Communication Profile. Its position within the general TCN architecture is here highlighted.
The communication profile is a part of the Train Communication Network, which allows to achieve interoperability between Consist Networks (e.g. the Ethernet Consist Network defined in part 3-4) and the Ethernet Train Backbones defined in part 2-5.