Logistics

The logistics for this trek are extremely simple. It's Sweden after all.

Getting to the start
For most people coming from the south the train to Abisko is the easiest way to get there. And by far the most civilized. There is a fine sleeper service, with a restaurant car. It takes 18 hours on the night train from Stockholm and arrives at about 14:30.

Getting back (however reluctantly)
In season there are one or two buses a day from the Mountain hut stop at Vakkotavare to Gällivare from where a train runs overnight to Stockholm and the outside world. Luckily the train is full of hikers which provides a bit of a buffer from the shock of returning to what is known as "the real world".

Notes
Both these trains can be full in season so these need to be booked well in advance. We booked in May for August. 
A small pack of water is supplied. There are power sockets in the sleeping compartment.