Timmy Mark's Field Journal is a note found on the body of a child Alliance Volunteer on a bed in Post Office Station.
"Field Entry 46
Those sons o' bitches wanna take down the line again. I snuck through the minefield and heard 'em talking 'bout stockpiling some heavy-duty shit. Not just C4 and frags, but Mini Nukes too. I'm heading back tonight for more intel.
Field Entry 47
OK, I'm through. They're keeping the nukes hidden beneath a train car in the ScolSq/Downtown line. Not sure which car, though. They'd want to keep it close.
Dammit they're waking up. I need to get out of here quick. If I don't make it, I'll toss the journal. Here's hoping this falls into the right hands."