I know Lionel made the 6-12020 Uncoupling Track 5" and the 6-12054 Straight Operating Uncoupling Track 10".
The 6-12020 comes with a wired button to operate.
The Lionel website says (for the 6-12054) "Includes a central magnet and control rails that are push button activated, allowing items to become uncoupled as they pass on this piece of track."
To me, it's not clear.
I'm looking to see if there is a remote uncoupling track that can be activated from the Legacy Remote.