Well, I wasn't anywhere near getting Radio first. I had to get to the modern age all by myself. Luckily, there is an abundance of luxuries for trade, so I was able to research at 4 turns per advance and still make some money. Once I got refining, I noticed that the English didn't have any oil - and they immediately became my target. Tanks alone wouldn't do it against all their Infantry in metros - I would have to wait until Modern Armor. So, I bided my time, building Tanks for mass upgrade, and focusing on building economic improvements and artillery, and making sure I had over 100 tanks, and the money to upgrade them. This necessitated markets, banks, and stock exchanges EVERYWHERE.
Well, I now have Synthetic Fibers and MA, and am rolling over the English. They had traded with the Mongols for Oil, and, MUCH to my chagrin, they now have 70 or so MI. I got the world to declare war on them, which isn't much help since France has been eliminated, Germany is down to 2 or 3 cities on the other continent, and I am between Russia and England. But, they no longer have oil, and can therefore build no new MI. I am rocketing toward Stealth, and hope to trade my way up in tech with Russia once I finish researching it.
One absolutely vital move I made in this game, without which I would have been unable to catch up - I moved your Forbidden Palace. It was tucked down in the SW corner of your empire, in Richborough, if I remember correctly. I tried to decide on an optimum location - I chose Cologne, and although I think there was probably a better location, I could build it fastest here because of a nice combo of flood plains and hills. So, I made the tough decision to abandon Richborough, and when I rebuilt the FP, my income doubled.
I have also squeezed some new cities into your empire - one in the jungle right next to Russia, one between Entremont and what used to be Richborough, one on the coast SE of Entremont, one on the ruins N of Cologne, one a few tiles SE of that, and one in the empty square of space between the 4 cities SW of Cologne.
I was wondering which win conditons are active in this game - if it's SS, it could get pretty hairy - Russia has already built Longevity, Cure for Cancer, and the Internet, which means they are about 7 or 8 techs ahead of me. I'm not sure if it's winnable, but we'll see how it plays out,