This skill uses the all-new GTFS feed to capture every delays and service alerts that MTA posted, planned or unplanned. While some of the other skills stopped updating since October, this skill uses the newest GTFS format to get information directly from the MTA server. In other words, the alerts will be in-sync with what you would see on the MTA website at the moment.
Try saying the following: add the [line] train - add the requested line into memory, and check its status automatically when opened next time delete the [line] train - delete the line from memory delete all lines - clear memory list all the lines - list all remembered lines check the [line] train - check the status of the line without remembering it