Slow motion machines use a steady flow of current to keep the points against the stock rail. So a pulse of power won't work. I use both types of machines on my layout, solenoid types in hidden areas (because I had them) and stall motors elsewhere. I use the same power supply for both (DC) Note the slow motion motors require DC, while the solenoid type work with either AC or DC. I built a capacitor discharge system many years ago and it worked well, but I don't use one now and can throw 4 turnouts at once thru a diode matrix with no problem. Because of this experience, I'm not sure why for the past 20 years or more, the hobby press has been extolling these capacitor systems. I do not recall offhand the specs of the transformer I use, it is large. If anyone is interested, I will check it and post. I use stud and probe mostly, tried various push buttons but welding is a problem. I suppose this is the reason for the cap system. Note that it is DC which gives this problem much more so than AC. An electrical engineer once told me to put a diode across the terminals of the switch (in parallel) it would help prevent the arcing caused when the cicuit was broken. I never did it tho. I have installed turnout switches made by (I think) Acme which have worked so far, but really haven't seen much use yet. They basically consist of a brass bar and phosphor bronze wiper material which is held beneath a push button cap, with a red and a green button intended to be mounted on a panel with track diagram. Again, if anyone is interested in more info on them, let me know I will check.
Gary