I travelled on the 'main line' last August, as well as the Metro in Palma. I'm doing Soller this Summer. The line is electrified from Palma to Enllac/Empalme, which is the station after Inca. Until this point, the line has quite a modern feel, Palma Intermodal being quite a new build station. You'll need to leave the train here and transfer onto a small DMU which will be waiting in the other platform, or just arriving. An announcement is made in English on the approach to Enllac.
From Enllac to Sa Pobla/La Puebla and Manacor, it has quite a rural feel, with many small towns and villages en route. However, the air conditioning is rather diminished on these little trains, and they are less comfortable, as well as being quite graffitied. Sa Pobla didn't seem to have much of interest, but Manacor appeared to be much more substantial.
Fares are quite reasonable, I remember it being about no more than Five Euros for a Palma-Inca single, and a Inca-Sa Pobla return was 4.15 euros. Ticket gates are in operation at most larger stations, eg Palma, Inca, Manacor, as well as the inner city stations up until about Marratxi as far as I can remember. The tickets resemble receipts, and you scan the barcode on them.
Now, onto the Metro. There are two Metro lines, one from Palma to UIB, and one from Palma to Marratxi. These trains are 2 cars in length, and tend to be quiet outside of University term time, and the UIB line, which I used, is generally underground until the second to last station where it comes into daylight. Fares are quite reasonable, a Palma-UIB return was 3.10 euros.
Service frequencies drop in Summer holiday times, such as when I visited in August. The Mainline sees one 2tph Palma-Inca, with 1tph connecting to Sa Pobla, and one to Manacor. These services call at all stations, as Metro line 2 [Marraxti] doesn't run during the Summer and so the mainline trains call at these stations to compensate.
The Metro line 1 has a sparse service of 1 train per 90 minutes, with some extras giving a 30 min gap at times. I made the mistake of leaving the train at UIB and it left without me, and there is nothing at UIB station, with it being the University station, and nothing around it, so be prepared for a dull hour and a half if the train leaves without you.
Overall, the lines are interesting, but the Metro is nothing fantastic, it's worth a look at, as due to the sparse service, there are lots of sets left in the Intermodal station, some in quite bad condition considering their age, just about 8 years. The station itself does seem too large considering the intervals in the summer, and it's all underground. It connects onto a large bus station, too.
There are also some series 91 units for the intended extension to Arta from Manacor in the station, I'm not sure if it has gone ahead as intended though.
https://www.flickr.com/photos/richgtransport/sets/72157635097955734/
Some photos from my Flickr on the link above.
Hope this helps!
