I am satisfied that the inexpensive transient voltage suppressors suggested by GR John and others that I have been using for years now are satisfactory voltage spike protection for my toy train engines. They are far better protection than the expensive PowerGuards that I bought way back in the early Forum days. I donated one of mine to Dale Manquen (RIP) for an autopsy and he concluded that it was not near as effective as a 50 cent TVS. With tongue in cheek he noted that I could still use them as $85 pilot lights to indicate layout district power status........so, see two "pilot light" PowerGuards above the meters in my crude attic control center
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