Smart Ride is actually a lot more than that. It takes advantage of the phone's capabilities to show nearby stops, maps, alerts, and other realtime info. I love those LED displays and use them all the time, but they aren't available at every stop. And we happen to support 45 or so transit agencies these days, all within one app.
We aren't trying to innovate in the vehicle tracking area. We are innovating around data aggregation (we have a huge and growing database of transit data, most of which is realtime) and around clever ways to present that data to our users. Smart Ride is one of those apps where it has to be on 24/7, be very fast, and very simple (so my mom can understand it). The whole point is to make transit easy for everyone.
But as another poster pointed out, the merits of my entrepreneurial pursuits (or lack thereof, your mind) shouldn't justify me being sued for patent infringement.
PS, that app you linked to is *not* an official SF MTA app. It is another 3rd party developer like me, who apparently is benefitting from the name confusion. As far as I know, SF MTA doesn't have an official app of their own.