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MTH F7 locomotive
Once the tires are stretched out trying to stall it as you did, they won’t work again. Some of my MTH engines are ten years old and still have the stock tires on them, working fine. I pull long trains with no problem.
If someone wishes to have speakers in both units, they can purchase both A units separately. These are sold as a slave-master set to make running as a single engine easy and saves some money.
I run these on Bridgewerks DC packs and they run excellently. They come with a list of approved power supplies in the instructions and online at MTH.