Represents the raw strings that should be written to the files.
Represents settings which are stored on the server
Holds info about currently active subscribers
calls only once per application life all observers are ready to listen service's events
calls only once per window life
Subscribe to a particular streamlabels stat
the stat to subscribe to
End a streamlabel subscription
the subscription object
all services must be created via factory method
replace init function
Holds data about the currently running trains. Will be updated by socket events and be used to generate output.