The train is Big Walk's best fast-travel option — and its most common sticking point. Getting the island railway running is a multi-step puzzle chain built around the blue tower. Here is the whole process, start to finish.
Overview
The train needs power before it runs. That power comes from a key, and the key comes from the blue tower — unlocked with five red puzzle prizes. The short version:
- Find the blue tower, past the red bridge.
- Collect 5 red puzzle prizes from any puzzles on the island.
- Place the prizes in the cases on the tower rooftop → a key appears.
- Cut the key at the key-cutting stations around the tower's base.
- Take the finished key to the train station and insert it into the keyhole.
Every train on the island starts running — and jumping aboard earns you the Big Ride achievement.
Step 1: Find the blue tower
The blue tower stands in the area past the red bridge — Quest Daily places it roughly north-east of the starting base (map coordinates around 3540, 1850 per Screen Hype). If you haven't crossed the red bridge yet, that's your first landmark. The tower is hard to miss once you're in the right area.
Step 2: Collect 5 red puzzle prizes
Puzzles across the island dispense red prizes — the same kind you may have already earned from the four starting-area puzzles. Any puzzles count, so split up, solve whatever your group finds, and pool five prizes. See the all puzzles guide for how prizes fit into the island's wider loop.
Step 3: Place the prizes on the rooftop
Climb the blue tower and place all five prizes into the cases on the rooftop. With every case filled, the tower dispenses a key.
Step 4: Cut the key — five stations
The key doesn't work yet — it needs cutting, and this is where most groups stall. According to Screen Hype's step-by-step train guide, there are five key-cutting stations, and they're not clustered at the tower's base — they're strung down the mountainside below it:
- Cutter 1 — right by the blue tower's door.
- Cutters 2 and 3 — along the edge of the same mountaintop.
- Cutter 4 — midway down the mountain path.
- Cutter 5 — at the bottom of the path; its arrow points you toward the train station.
After each cut, the top of the machine shifts and reveals an arrow pointing to the next station (Insider Gaming describes the same marker-following loop) — so when in doubt, trust the arrows.
Step 5: Insert the key at the train station
Carry the finished key to the train station — Screen Hype places the access slot at map coordinates 3380, 1740, northwest of the tower — and insert it into the keyhole. The railway powers up and all three trains on the island — red, yellow and green — start running their loops. Step aboard any of them to unlock the Big Ride achievement.
Using the trains
- The three trains loop the island continuously in one direction, with several stations along the route.
- You don't have to board at a station — walk parallel to the track and jump on as a train passes.
- On board you'll find a walkie-talkie and a radio.
- The train can be stopped, but the control must be held — assign someone to brake duty.
Other fast-travel options
The train isn't the only way across the island: the chairlift (ride it for the Big Sit achievement) and the secret tunnels (find one for Big Tunnel) are the other fast-travel options. And once you've handled the railway, the map room — unlocked through the red tower — makes navigating everything else far easier.