So you will do the Lucerne - Interlaken leg 4 times (twice in each direction). That means 4times 2 hrs/15 CHF/pax with half fare card.

Hi neckervd ,
Since i am traveling with a child, i am planning to stay at Lucerne and travel from there,
a) Is it possible to cover Day trip to Gungfrau, back to Lucerne in a single day.
b) Is it possible to cover Mt Pilatus in half day ( Arrival day on 7th oct ) in order to save 1 day in Lucerne.
Regards
Have a look at my post 2 and you will find all the answers you need:
For rail passes consult http://www.swisstravelsystem.ch/en/
Timetables and fares: http://fahrplan.sbb.ch/en
(But enter "Jungfraujoch" and NOT "Gungfrau" and "Pilatus Kulm" instead of "Mt Pilatus"
Hotels:
http://www.booking.com/
http://www.bnb.ch/
http://www.swissbackpackers.ch/
http://www.youthhostel.ch/home.html?&L=1
http://www.accorhotels.com/gb/india/index.shtml

hi neckervd, i think you were right earilier regarding the Lucerne - Interlaken leg 4 times, just checked the timetable, the round trip time is around 8 hours travel from Lucerne - Jungfraujoch -Lucerne.
Now i am planning to shift 1 night stay from Lucerne to Intrelaken, and the plan goes as below
1) Day 1 - Zurich airport (9am) to Luceren hotel ( 11 am), settle down, if possible 1/2 day trip to Pilatus Kulm
2) Day 2 - Day trip to Mt Titlis , back to room, evening if possible a lake trip
4) Day 3 - Early morning to interlaken via a golden pass line, halt at interlaken room
5) Day 4 - According to the weather visit Jungfraujoch or visit Montreux via the golden pass line and get back to hotel at interlaken
6) Day 5 - Interlaken to Zermatt, visit Gornergrat on this day and back to room
7) Day 6 - Zermatt to Chur (instead of St moritz) via the glacier express (heard Chur to St Moritz is not that much worth a visit..) halt at Chur
8) Day 7 Chur to Zurich back
Please advice as i dont want to miss out any near by places in the above destinations.
heard Chur to St Moritz is not that much worth a visit.":
Who told you this nonsense?
Why should a half day trip to Pilatus not be possible? You got all the timetables!
Titlis - Lake trip: you need not go back to Lucerne for that: board the boat at Stansstad, the place where the Engelberg - Lucerne train crosses the Lake on a bridge. Stansstad dp 11.56, 14.06, 16.06, 17.06, change the boat at Hertenstein, go up to Gersau or Beckenried and change there to a Lucerne bound boat
http://www.fahrplanfelder.ch/fileadmin/fap_pdf_fields/2011/3601.1.pdf
http://www.lakelucerne.ch/fileadmin/lakelucerne/redakteur/Internet_PDF/Ganzjaehrig/Fahrpl%C3%A4ne__2011/02_Sommer_LzFl_2011_def_high.pdf
What do you want to do at boring Interlaken during a whole day?

hi, first of al thanks a lot for your time and responses,. I have changed a bit in the plan, please suggest accordingly
Day 1 - Zurich airport (9am) to Luceren hotel ( 11 am), settle down, if possible 1/2 day trip to Mt Pilatus Kulm (is this possible, if i start this by 1 pm)
2) Day 2 - Day trip to Mt Titlis , back to room, evening if possible a lake trip
4) Day 3 - Early morning to interlaken via a golden pass line, stuff the luggage at the locker, According to the weather visit Jungfraujoch or visit Montreux via the golden pass line and get back to hotel at interlaken
(basically looking forward to travel in the Golden pass train, my child loves the train travel so..)
6) Day 4 - Interlaken to Zermatt, visit Gornergrat on this day and back to room
7) Day 5 - Zermatt to Chur (instead of St moritz) via the glacier express (next day i need to travel to paris..) halt at Chur
8) Day 6 Chur to Paris (Plz suggest the best way via Train, any scenic trains on the way?)
9) Day 7 visit to Disney Land
10) Day 8 1/2 day visit to Disney Land, evening visit around Paris
11) Day 9, depart back home by 2 pm