Just south of the waterlogged junction, where the rubble is piled high, is a narrow brick alley. Use the fire escape to reach a pair of crafting workbenches and a terminal (Novice) for turning off the spotlight. There’s a footlocker up here, too (Advanced), a safe to pick (Expert), and some rather natty formal gear.
Armaments and Ammo Crafting: Armor Workbench Crafting: Cooking Station Crafting: Weapons Workbench Danger: Grenades! Danger: Tripwires! Health or Chems Services: Trader (Opal)”— Offical guide
This Railroad hideout appears only in Fallout 4.