The other 68 km use a dual gauge: the narrow and the standard one (1,435 mm).
The lines west and south were converted, with the line to Maryborough converted to dual gauge soon after.
By 1868 all lines were dual gauge so the essential motivation for the dock was no longer present.
If so then perhaps it would have been cheaper to build the line as dual gauge from the start instead of building a dock.
Volos station was converted to dual gauge, in order to accommodate trains of the two branches.
On 13 November 1922 the dual gauge was removed.
I have mounted a dual gauge on the dashboard using existing holes for the mounting screws.
The first step would be to install dual gauge as part of an upgrade in heavier rail.
In Västervik there also is dual gauge in the station area.
Unfortunately the difference between these gauges of only 6.5 inches was not enough to allow safe third rail dual gauge.