Darwin:Train Alert data

The NRCC or a TOC can send important announcements (textual information known as train alerts) out via the Push Port. These alerts can be attached to various services and individual stations called at by those services. Prior to version 11 of the data schema these were known as “Ad-hoc alerts”. As a part of a Snapshot (Standard or Full), Darwin identifies train alerts and the services and stations to which they apply. As a part of an Update, Darwin provides new and revised versions of these alerts, as information becomes known to Darwin.