SUMMARIZED / REFORMATTED FROM http://www.opendataphilly.org/opendata/resource/158/sms-transit/
Base URL: http://www3.septa.org/sms/
Parameters:
- var1 = stop id
- var2 = route id OR i/o for inbound/outbound
- var3 = i/o for inbound/outbound only if route id is supplied.