The TVS units I typically recommend are bi-polar devices, so they don't require adding two for an A/C output.
1.5KE36CA at Digikey
I designed avionics for many years, and we had very harsh protection criteria for many of our boxes. I learned a lot about transient protection, and we used a lot of TVS devices in many of the designs. I also have an impressive collection of ferrite beads of various sizes that got generously sprinkled around on boards, primarily to prevent emissions. It is rare for a new design of a complex piece of avionics to make it through all the environmental testing without some tweaks, and they usually were in the EMI emission and protection arena.
Even the guys that are EMI specialists don't claim to have all the answers as far as EMI and lightning protection is concerned, and I don't either.
You may consider a TVS across the pickups of a locomotive to be overkill, and you have every right to hold that opinion. My opinion is the TVS is a valuable transient protection device, and for the 50 cents I spend on them in quantity, I plan on continuing to use and recommend them. I disagree with your opinion that they're not useful in a command environment, and I'm a bit confused how you come to that opinion.
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