Caltrain is not dog friendly

I was out with some clients today looking at a dog friendly condo near the Caltrain stop in Menlo Park.  One of the clients, who works in the city, asked me if he could take his dog to work with him on the train.  Unfortunately, Caltrain (and BART) are dog unfriendly.  Service animals, such as guide dogs, may accompany persons with disabilities on Caltrain if the animals are on a lead that does not interfere with passengers and the animal is under the constant supervision and control of the owner. No other animals are permitted.