How about using @gunrunnerjohn's YLB?:

    JW&A - 10500 - Your Last Battery, Batt. Replacement | Hennings

You'll still need the roller, which if you're lucky may be this snap-in part:

Check your trucks to see.

Mike

I believe that is the snap-in that will fit the plastic trucks on this model.

Thanks for the tip. So if i get the collector and snip the 9 volt battery terminal and wire it to the truck I should be good to go?

@Pennsy641 posted:

Thanks for the tip. So if i get the collector and snip the 9 volt battery terminal and wire it to the truck I should be good to go?

Dear lord, for the love of trains no.

9V DC regulated VS unregulated AC track power. Doing what you just said will smoke that sound board.

Did you completely miss the part where using a YLB (Your Last Battery) a custom circuit board meant to replicate a 9V battery with Capacitor storage that also has a charging interface wire from track power- note since the board is not "grounded" you actually need 2 wires in this install.

Wheels and 3rd rail.

@Mellow Hudson Mike posted:

How about using @gunrunnerjohn's YLB?:

    JW&A - 10500 - Your Last Battery, Batt. Replacement | Hennings

Again sorry be being so pointed on the answer there, but your first post starts out- you basically have the idea:

@Pennsy641 posted:

I would need to add a voltage reducer from the 18 to 9 volts and of course add a pick up roller on the truck.

But then you jumped to:

@Pennsy641 posted:

So if i get the collector and snip the 9 volt battery terminal and wire it to the truck I should be good to go?

It could just be omission, but the way I read "it" in that sentence, is cut off the 9V snap connector of ("it") the sound board, wire the red and black sound board wires to a pickup roller assembly- and nothing else.

The YLB performs 3 functions. The charging circuit regulates 18V AC track voltage also converting to DC and then charging up set of supercapacitors- to ensure there is voltage to the sound card and it doesn't restart when the pickup roller looses power- either in conventional operation or just switches and other common places in a layout for a roller to not see track power while traveling.

Now absolutely, you can DIY this, buy off the shelf modules that take in AC, regulate to 9V DC, and they might have more conventional capacitor ratings that won't hold the power as long during dropouts.

But you still in many way have to do those 3 things

• Convert AC to DC
• Regulate high voltage DC from the rectifier to regulated 9V voltage for the sound card
• Provide some capacitance to smooth the potentially rather rough power for smooth safe regulated DC for the sound card.

You still need to rectify the track AC voltage to DC and then regulate the voltage down to 9V.  Rod Stewart designed this DIY module to do all that, plus DCS protection and stay alive protection.

Bob

AC-DC LM317 DIY Voltage Regulator