&gt; You build an ADA compliant system.<p>Right, the system can be very easy to get around in, but it&#x27;s the system to destination legs that can be impossible.  This is <i>almost</i> always bridged with some kind of handicapped-accessible bus system in addition to the normal bus system. But then we&#x27;re back to surface vehicles. Trains can <i>never</i> provide door-to-door service, it&#x27;s a classic &quot;last mile&quot; problem.