I too just recently realized that Thor's website was no longer available and my usually pretty trusty friend "wayback machine" for whatever reason did not save his website. I also was on it just a month or two ago and didn't try to save it then, much to my regret now.
In this thread a month or so ago @Ted Bertiger mentions actually knowing Thor personally via the local train club and his wife a little too. I do not want to be a burden on anyone but if his wife can be re-contacted, she may appreciate knowing the interest in and appreciation of his website that still exists and be able to assist with getting the data needed to get it rehosted.
If there is anyone that was smart enough to save the website or if we can get in contact with Audrey and get the information, I for one will donate towards getting it back online. It looks like @Dennis-LaRock may have the knowledge/experience to get it back up?
I have also thought about contacting the provider, (which seems to be yahoo if you follow the link to find the provider on Tucows?) and seeing if, assuming they still have the data and it is just a matter of payment and flipping a switch, would except payment from someone else, aka like one can with paying utilities.
I spent countless hours of my childhood on his train and army men website and have continued to reference it over the years and would love to get this jewel of a website and resource back on line.