I recently posted about how to activate the protosound on the mth subway var 30-2446 with. regular zw transformer. Nelson W kindly answered for me to buy a lionel bell, whistle and horn control on bay for about $10. There are two such items on eb
ay...the lionel 15905-1 bell horn and whistle sound activation switch for $10/// and a
lionel 6-5904 bell whistle and control switch for $12. /which one is the correct one to use with a zw or 1033 lionel transformer. thanks,
Ed Roth