Main Quest Mission
"Meet the journeyman and cross the tracks"
There are five military soldiers at the fallen bridge in the middle of Cordon.
Occasionally, you might get enough enemies to spawn and kill them all, but
chances are they will be the survivors. Unless you wrangled an AKSU from one
of the soldiers on patrol in the south, you will be outgunned. The way through
would be by the old train tunnel west of the fallen bridge. To get through,
use the bolts to trigger the first half of the electric anomaly and sprint
(not run) to the box debris in the middle (it's a safe spot). Instead of the
tunnel, you can also attempt to go up and over the hill (across the tracks) by
climbing to the top of the hill and slipping through the crack in the fencing
(some guy named Tom Randolph mentioned this, but it's obvious if you scouted
with the binoculars). The only trouble is if the soldiers see you, you need to
sprint north with them chasing you. You also stand the chance to miss a Viper
5 SMG (spawned randomly with the dead guy) in the tunnel.
Assuming you stuck with the tunnel, you can rest at the midway rest point. Use
the bolts and again trigger the anomalies (you need three or four bolts per)
and chain detonate them. Sprint through the second half of the tunnel and
you'll be on the other side. Once you are, you won't be going back through
unless you want to brave the tunnel, sneak around the outpost (going up the
hill on the sides work), or blasting through the checkpoint (only a few of the
soldiers at the fallen bridge respawn if killed). Once you get past the
railroad, you are on the way to a new misson.