<human>:  Would the fastest tortoise win a race against a Chicago "L"?
<bot>: No, the fastest tortoise would probably lose a race against a Chicago "L". Top speed of Chicago "L" is 55 mph (89 km/h). The Guinness Book of World Records maintains the record for fastest tortoise: the tortoise ran at an average speed of 0.63 miles per hour. So the tortoise would lose a race against the train.