Bob-- if you want we can take a brief look at this in a couple of weeks when Derby stuff dies down. But in fact someone once did a study, and I\'m pretty sure it was of the Epsom Derby, showing that the average time had improved in every decade. Might have been in the Scientific American article I quoted.
As for grass races in general-- paces are much slower, especially in Europe, and can affect final time-- that\'s why we have \"S Pace\" notations. Nevertheless, there were some unbelievably fast grass times last year-- I did a post in response to Frank raising the same issue right around the last BC. If you do a search you can probably find it.
I\'m pretty sure Watchmaker does read this site, given some of what he has written. And he was at the Expo, where I talked about it.