you can get adapters to connect the current trackmaster to the old, and from the old trackmaster to connect to the tomy blue track. the trackmaster/tomy adapters are no longer available from stores, but sometimes appear on ebay. for trackmaster/trackmaster, i think sets are still including those ones, but could be wrong.
images on this page here, scroll down to trackmaster adapters. http://sunsthomasandfriends.weebly.com/tomytrackmaster-comparison-and-special-track.html
keep in mind, the old engines dont work well on much of the new track, and the new engines have trouble on the old track. the pre-revolution trackmaster engines have only minor issues on the tomy blue track.
for tracks by other companies, you would likely have to make your own some how.