If you have any problems with dissappearing elements (railoads, selection circles, shadows not showing up etc.), than try to use dgVoodoo 2
. In my case I am using a 64-bit Windows 8.1 installation and dgVodoo 2.5.3 with an Skylake i3 CPU and Intel HD530 integrated card.
dgVoodoo 2 homepage: http://dege.freeweb.hu/dgVoodoo2.html Direct download for dgVoodoo v2.53
(released: 11.09.2016) http://dege.freeweb.hu/dgVoodoo2_53.zip
To install, simply extract the dgVoodooSetup.exe into you solders installation folder (default location: C:\GOG Games\Soldiers - Heroes of World War II) and the three .dll files you can find inside the MS folder.
Here are the configurations and some screenshots: