I'd warn you of a couple things if they are correct?
Some Lionel equipment should not be used with over 18 volts on the track. I lost some with no warning, and no nothing!
The choke should be used if a piece lowers the signal level to any DCS engines.
Our grandson just got a Polar express that must have been old stock. The speaker blew out in the first day. So I'd have to recommend turning down the volume on those until I learn more about them.