The top one looks like a railway sleeper. Not sure what the metal banded ones are. Not sleepers anyway. Perhaps part of sheep or cattle pens for when they were transported live in cattle trucks or something?
With regard to asbestos in brake pads, it used to be in all cars too.
It was banned because employees servicing vehicles could breath it in, as far as I know.
Not because passers by or passengers could. Maintenance staff whose heads were right over the area banging it with hammers or disturbing the dust in a confined area. Which as you know is a risk to their long term health.
So working through what you've said and what we've gleaned so far:
A) you know these things are old because if your creosote research and there is no dust on them now because for twenty years the wind and rain has blown it away
B) you know that dangerous things can't be sold as people would sue for compensation so it must be safe or it wouldn't be sold.
C) cars - including classic cars (which had asbestos brakes in the past) are still serviced in garages and if there was a risk they wouldn't be or it would be fine with full hazmat suits and breathing apparatus. So it's fine to be around something that used to be next to brakes made of asbestos as long as they aren't there now.
D) you do not intend to sniff them, lick them or grow veg in them so they should be safe for looking at and being around as they are outside
E) tests are available if you still want peace of mind. Although this could be expensive, I don't know and honestly I think they would be surprised at your concerns as prob not many people would think of health issues and possibly even put your mind at rest over the phone without having to check - depending on how greedy the company is!
F) why not just get them removed by a garden company. They've probably done this before and won't even cross their minds about the asbestos as they are in the fresh air and wouldn't feel it risky the way you do.
Talking of which, remember we were all safe from covid outdoors because the wind blows things away, perhaps that's something else to consider for reassurance?
Just decide on a course of action and proceed as you need your sleep! Personally I wouldn't worry at all about it. Just saying so you know I'm not agreeing with your feelings I'm trying to go through a rational and evidential process to allay them.