关于瑞航机票

在瑞航网站上订机票，下面有这么一句说明：

The Airtrain service is operated by Swiss Federal Railways SBB. The boarding card you obtain when checking in (Web Check-in or at the counter) also serves as a valid rail ticket. Any train can be used on the day of air travel. Baggage check-in only available in or to Zurich.

有两点不明白：

1.是否凭机票可以在当天搭乘到达机场或离开机场的火车。（因为不明白Airtrain和一般的train有什么区别）

2.Baggage check-in only available in or to Zurich.这句话不明白。航程是从上海到苏黎世，然后联程航班去巴塞尔。