The people that sold then to me, for £5 each, said I don't know if they will take the weight, I said do you know how much trains weigh then!!
Even a tiny lightweight train is around 40 tons!!
We used them years ago on my dads artic truck as support, IVECO 190/29(magiruss deutz!!), and that weighed around 6.5 tons, had cab crane on it as well, they didn't flinch.
tabetha