As you are undoubtedly aware, the standard Lionel Electronic Diesel Horn Shack of the late 1970s generally emitted a strangled tone vaguely reminiscent of a small weasel with digestive issues. And this was when the little beggar was in good nick.
This one, however, has been repurposed. As can be deduced from the label on the button, the old electronic board in this one has been removed in favor of a USB programmable board, currently loaded with an MP3 of an actual trolley bell. So, when the button is pressed, the dulcet tones of a passing streetcar waft sweetly out into the air... 
The renaming? That's a shout out to my favorite horror show host, Svengoolie, who may be heard on your local Me-TV station on Saturday evenings. http://svengoolie.com/ "BERWYN?" is a catchphrase on the show...
In fact, this little shack actually made it on the air in February!
The Santa in the background was a prototype for the flatcar. A different Santa was ultimately used.
-MMM-
