What are these?

thanks Super, you're (once again) a step ahead of me. I found out info online and of course we use the blue tomy tracks. I have tried to religiously stay away from any other tracks. I could just imagine the confusion, not to mention my wife's reaction at seeing 'another kind of track'
Then I look at the little flippers under the train and imagine my 3 and 5 y/o with them. this one might go away for a while, lol.