I'm reading the T&C and I'm not sure what a train number is.
Members may earn points for one train ticket used on a single train or individual train number on a single day. Multiple tickets for the same train or individual train number, on the same day, will not earn will not earn points.

So, in the course of a single day and for the purpose of earning points for Select status, are 2100, 2104, and 2160; three individual train numbers or just 1 train known as Acela Express?