Rail sounds wiring

Hi - I wired a few pieces of track and a transformer like fig 1 and got the rail sounds for my #8118 MoPac B (1991) unit to work. So I have a Sante Fe #364 (older engine - Gilbert maybe?) and it doesn't make a sound - maybe this uses different tech or something?  It says on the bottom that it has a "horn".  There is no "shut off" on the #364, so I'm worried about wrecking it.  NOW THE BIG PROBLEM. So I have 4 track clips, look at figure 2, it seems like the push buttons must be in series with ALL the clips ... but this could take quite a few amps going through theses devices .... how do folks wire these up?  Do I put the control buttons in series within only one of the track clips and the control voltage makes it out onto the rails through this one leg?  Thanks