If you have got the time it's a great area to stay over night. There is accommodation at the station, there is a youth hostel close by and a bothy within 5 miles from the station and also loads of options for a wild camp.
Loch Ossian wild camp (view from the tent) 17th June 2010If you are planning catching the train in and out in one day I would suggest making sure you have enough stuff with you for an overnight stay just in case you miss the train or the train doesn't turn up. it wouldn't be the first time the line has closed or trains haven't run at short notice.
All the best.