Dave to expand even more on what was said above. There was an evolution over time on what the hardware was that was used as train sounds also. So a specific model would help identify what you have.
First was the Railsounds on an independent board and power supply. It was followed with a single independent board and called RS2.5 It was the first TMCC integrated RS. When Lionel went to RS4.0 it was an upgrade of 2.5 and became modular 24 pin plug boards.
Lionel then made a "Conventional" Railsounds to add to starter sets. Same modular boards but they did not have TMCC capable sounds. Just bell and whistle button sounds.
Later this Conventional Railsounds became "Trainsounds" followed by becoming a single separate board again.
So as stated Trainsounds is conventional only.
Station Sounds was as John stated a RS4.0 hardware but used in a passenger diner to simulate a different sound set to go along with the engine sounds. Replicates an MTH Passenger Sounds effect in PFA.
They also made a Caboose Sound set called Crew Talk that was made in a few caboose models. Both 2.5 and 4.0 hardware.
If Station Sounds not working treat it like a RS engine with no sound. Do a reset or reprogramming. You can download a instruction manual from Lionel Website. G