When you give it the 2 stations you are travelling between, it tells you what time the next 3 trains are arriving. If its available, a track number is also provided.
6/26 Updated to support trips involving transfers and reduce startup time.
“Alexa, ask metro north track i am going from Stamford to Grand Central”
“Alexa, run metro north track”
“Alexa, ask metro north track where’s my train”