Countries/cities that give free transport to those over 70 (US or EU Passport)?

As a senior, I take advantage of discounts but have found there is no consistency as to how the rules apply to tourists. Sometimes the discount is given to everybody, sometimes only to locals, sometimes to holders of an EU country's passport. If it seems there's a discount, just ask but I think it would be difficult to determine in advance, with a few exceptions, whether it will be allowed until you are actually there.

Austria gives at leasr 45% discount on trains and most buses. You get the discount card by going to the Austria train site and you are mailed a discount card to your address in the US.

Surely we cannot have landed in the only 2 places where this is done so nicely....
I do think they're rare in being actually free.

For long-distance train tickets, visiting seniors can get deals in Austria, Belgium, Great Britain, Finland, France, Germany, Italy, Spain, and Norway. I'm not well aware of the options in "Eastern Europe." Qualifying ages range from 60 to 67 years old. To get rail discounts in the bolded countries (and a second tier of discounts in France) you must purchase an annual senior discount card at a local train station, with prices varying from a low of €5 in Spain to a high €127 in Germany. The discounts that they earn you also vary. Details are summarized under the single-country links on our rail pages and usually in the transportation appendix of Rick's guidebooks. These alternatives may be available on shorter notice than advance-purchase ticket discounts, but usually are not as significant as the best advance-purchase discounts. Most rail passes don’t offer senior discounts, but BritRail and Balkan passes do.

Sweden gave us 50% reduction in transit passes.

Thanks for all the pointers. I think the advice to 'just ask' is spot on. Nowhere in any of the literature (including BKK's own very complete information) was a US passport listed for free transit. It clearly called out the EU Passport, which was why we were surprised to find this applying to both types. Yay, Budapest. We'll report if we find other deals.

I think Warsaw does as well.

Slovakia. When you are over 62 you can travel all around the country by train for free. However you need a card which is done on the spot.