Detective Duck Train Walkthrough: All Codes (2026)

The Train chapter in Roblox’s Detective Duck packs some of the game’s cleverest puzzles into four tight compartments: a word cipher, a shape math puzzle, an acid-brewing sequence, and a photo that cracks the finale. This complete detective duck train walkthrough, updated for October 2026, gives you every code and step in order.

New to the case files? Read our Detective Duck: The Suburbs walkthrough first — it explains the core mechanics this detective duck train walkthrough builds on.

Detective Duck investigating on the train - detective duck train walkthrough guide

Detective Duck Train Walkthrough: All Codes at a Glance

Bookmark this detective duck train walkthrough so you can jump straight to any code mid-run:

Magic wand case: SNOWMAN
Narrow cupboard lock pad: 46
Steel panel keypad: 4940
Staff-only door: 9999
Correct suspect: the mechanic

Step 1: The Luggage Key and Scissors

In the first compartment, click the hanging red coat near the door to get a luggage key. Use it on the brown suitcase on the table to find scissors (some guides call them shears).

Step 2: The Teddy Bear Key

Use the scissors on the teddy bear in the corner of the compartment. Inside is a compartment key for the economy seat compartment.

Detective Duck Train Walkthrough Step 3: Fix the Door Handle

The door to the next compartment is missing its handle. Open the blue luggage on the overhead shelf to find a handle, attach it to the door, then use your key to move through.

Step 4: Decode the Word SNOWMAN

In the second compartment, your UV light reveals the numbers 2041-3-80 (check the open diary and the glowing walls). Use the magnifying glass on the glass windows: each window shows a number paired with a letter, for example 2 = S. Decoding the full set spells the word SNOWMAN.

Detective Duck Train Walkthrough Step 5: The Magic Wand Case and the Math Puzzle

At the magic wand case on a table, type SNOWMAN to open it. Inside is a shape math puzzle: the shapes are worth 10, 5, and 4, giving the equation (10 x 5) – 4 = 46.

Step 6: Wire Cutters and the Next Key

Enter 46 on the lock pad of the narrow cupboard near the doorway. Inside, grab the wire cutters (found on a seat in some guides). Use them to cut the steel wires on the top shelf and take the key hidden inside. Use it to unlock the next compartment.

Detective Duck examining a hatch with tools - detective duck train walkthrough

Detective Duck Train Walkthrough Step 7: The 4940 Code

In the third compartment there are three locked rooms. At the end of the hallway, a red diary on the floor hints that the code is written on the wall. Shine your UV light on the wall (or use the magnifying glass) to reveal the four-digit code 4940. If you get stuck here, re-check every wall — this detective duck train walkthrough step trips up many players.

Step 8: Open the Steel Panel

Go back to the first compartment and find the large steel panel with a keypad beside the doorway. Enter 4940 to collect two room keys and a lockpick.

Detective Duck Train Walkthrough Step 9: Open the Three Rooms

Return to the third compartment. Use the keys to open the rooms marked S3 and S2. The last room needs the lockpick.

Step 10: Brew the Acid

In the last room, take the lighter (check the table). In the first room, find a potion on a chair. Pour the potion into the glass bowl or jar on the table and light the fire beneath it with the lighter. Wait a moment and it becomes acid.

Detective Duck Train Walkthrough Step 11: Melt the Hallway Lock

At the end of the hallway, use the acid to melt the lock on the next compartment door and step through.

Step 12: The SD Card Photo (9999)

In the fourth compartment, check room B3 (second room on the right) for an SD card on the bed. Take it back to the first compartment and insert it into the camera on the table. The photo shows a security guard entering the code 9999 on the staff-only door lock. (The photo was taken from Room B3.)

Detective Duck Train Walkthrough Step 13: Open the Last Room

Return to the end of the fourth compartment and enter 9999 on the keypad. The last room opens. Read the red diary on top of a box inside to unlock all the clues for your investigation.

Step 14: Name the Culprit

For the investigation, find the broken lock on the floor of the last compartment and examine it with the magnifying glass: it has a distinctive dust and dirt mark. In Room B3, the toolbox shows the exact same mark, and the SD card was found in that room as well. All evidence points to suspect number 5: the mechanic carrying the dusty toolbox. Vote for the mechanic to close the case.

Detective Duck Train Walkthrough: Frequently Asked Questions

What is the magic wand case code in Detective Duck Train?

Type SNOWMAN. You decode it from the UV numbers 2041-3-80 combined with the number-to-letter pairs shown on the compartment windows.

What is the answer to the math puzzle in Detective Duck Train?

46. The shapes are worth 10, 5, and 4, so (10 x 5) – 4 = 46. Enter it on the narrow cupboard’s lock pad.

What is the steel panel code in Detective Duck Train?

4940, revealed by UV light on the third compartment’s hallway wall. Enter it on the steel panel keypad back in the first compartment.

Who is the culprit in Detective Duck Train?

The mechanic. The broken lock’s dust mark matches the mark on his toolbox in Room B3, where the SD card was also found.

Cleared the case with this detective duck train walkthrough? See the Suburbs walkthrough for the earlier chapter.

Axee Davies

Axee Davies is the founder of AxeeTech, publishing gaming guides, codes, and Windows how-tos since March 2013. A tech enthusiast for 13+ years — starting with smartphones and Android rooting — he now runs a site that puts out a new guide every day for Roblox players, traders, and Windows users. More about AxeeTech

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