There are a line I really would like to see and that is the old Eskilstuna banan. It went from Stockholm C to Eskilstuna with the branchline Akers styckebruk - Strangnas and the 600mm museum railway Laggesta sodra - Mariefred.
But it is very hard to get info about the line...
Some in Swedish here:
http://www.jarnvag.net/index.php/ban...talje-nybybruk
Laggesta in 1980:
http://postvagnen.com/forum/index.php?id=132763 Train from Eskilstuna to Stockholm C..
Laggesta in 1993:
http://postvagnen.com/forum/index.php?id=95390 In a couple months, no more SJ trains here...
This are the line today (2008):
http://postvagnen.com/forum/index.php?id=20201
The line closed in 1994 when a new line to Eskilstuna open.