boardrider

Hi,
On January, I'll go for a snowboarding vacation in Engelberg (Titlis).
Since its my first time snowboarding in Switzerland, there are some issues I need clarification with from the Swiss-old-hands.
So, could you please explain -

• what is "Halbtax", and who is eligible to receive it ?
  
• What is "Snow'n'Rail" ?
  
• What would be the recommended skipass to buy if I:
  
  
  Quote:

  Arrive in Switzerland via Zurich airport. Plan to get to Engelberg by Train. Will have 9 days of Snowboarding in Engelberg.

Thanks,
BR.