One of the rail levers (next to the target train where to plant the bomb), contains a second one placed in the ground of the map.

Also on the rail further down, the "next switch in line" can't be flipped (don't get a hand symbol to flip the switch).


Refer to the screenshot in attach.

Note: Yesterday i've updated to the latest GOG Signal Ops Patch 2.1.2.11.

Thanks for the report, we'll add this to our bug list to be fixed in a later patch.
You've probably figured it out, but these two switches are not necessary to complete the mission.

No, i've finished the mission in a meantime ;)

Very addictive game. Can't wait for SO2.