At one time I had an Al Trol walkaround memory throttle. This preceded command control and was rather simple in design as most trains from that era didn’t feature sound systems. It did have a momentum feature. You basically set your power supply which in my case was a ZW to 18v. The throttle then regulated the voltage going to the track. It had to be plugged into it’s own box with a phone like cord. You could daisy change additional boxes which allowed you to unplug the throttle and plug it into another station further down the line. I do remember not being able to get a Proto 1 engine out of neutral using it. Can’t remember how the QSI sound system worked with it. With my layout growing in size. The walkaround throttle even though tethered was a must have. I was able to get around the problem by getting the engine moving using the throttle of the ZW. Pretty sure you could then place the engine back in neutral. Then with a quick flip of a toggle. Switch the power so now it went through the Al Trol. Then you could run the engine with it. Worked fine as long as the engine remained powered up.
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