Dave is correct, but there is more to the story...
The BLE Lionchief and Lionchief plus Remotes (and App) can open 3 simultaneous connections. Therefore up to 3 of the same *exact* locos (same SKU) will operate just fine together. We also have a mechanism to operate up to 3 dissimilar products to work together in a scene, such as a loco and announcement coach (like the polar express).
This approach will allow ABA locos to operate together, each with its own BLE radio with unique ID and features. The universal remote can support 3 BLE simultaneous connections as well; which can be spread as one loco on engine select button, or when 3 BLE connections operate in a scene, on a single button.
When operating in this way, there is no need to disconnect; and commands are sent to all the devices under control of the remote or app.
