Ted,
Train Nut may be on to something - I looked for a Lionel manual in service and found none - but, when I checked parts, there is a Bluetooth pcb available.
So, one most likely needs the most recent version of the PE set with the optional Bluetooth control or you need the Bluetooth app from Lionel for a phone or iPad. I believe it is available in the stores for either android or iOs.
was there no manual with the car?
The Bluetooth would connect directly from the device to the car and trigger the announcements.
The manual from the 6-84328 - page 17 discusses the LionChief app and use -attached
LionChief app link is for smartphones in the play or apple store