To reach Ascona, Switzerland we strongly recommend travelling via Zurich. From there you can take a train to Locarno where a shuttle bus will bring you to the conference centre. The trip from Zurich main station to Locarno takes approximately 3 hours. Further information can be found here: http://www.csf.ethz.ch/travel/index.
We recommend the 12:09 train direct from Zurich to Locarno. To check the train schedule we recommend using http://www.sbb.ch/en/home.html. A shuttle bus connection Locarno to the conference centre will leave around 3:15 pm. You will find the bus stop on the right hand side of the train station (see map underneath).
Further smaller shuttle buses will leave later from Locarno for those registered to arrive later.
On the day of departure the shuttle bus will connect you to the 14:04 and 15:04 train to Bellinzona,where you can change to a train to Zurich.