Train Control Systems (which uses the logo TCS) established themselves in the early 2000s as a manufacturer of robust and full featured decoders. They popularized the concept of KeepAlive®  modules, both stand alone and integral to their decoders.

TCS plowed the ground of sound decoders with their WOWSound product line.

TCS has been marketing DCC systems since the early 2010s. TCS has a DCC system in a cab, similar to NCE's PowerCab.

Without extensive experience with them Bruce doesn't want to opine or discuss features and nuances.