Answers.Body: <p><a href="https://i.sstatic.net/46OSA.jpg" rel="noreferrer"><img src="https://i.sstatic.net/46OSA.jpg" alt="enter image description here"></a>
  It's an interactive piece that makes the train perform a cool(ish) function when it rolls over it.</p>
  
  <p><a href="https://i.sstatic.net/f4vDj.jpg" rel="noreferrer"><img src="https://i.sstatic.net/f4vDj.jpg" alt="enter image description here"></a>
  The train has a sensor on the bottom that reads the piece and does the deed.</p>
  
  <p><a href="https://i.sstatic.net/dtBj6.jpg" rel="noreferrer"><img src="https://i.sstatic.net/dtBj6.jpg" alt="enter image description here"></a>
  When the train reads this red one... it stops moving, which is sorta coolish  for a jealous older sibling maybe ;).</p>
  
  <p><a href="https://i.sstatic.net/xe0K3.jpg" rel="noreferrer"><img src="https://i.sstatic.net/xe0K3.jpg" alt="enter image description here"></a>
  Watch 3 videos explaining all the cool possibilities.  <em>(<a href="https://www.youtube.com/watch?v=p8O62jIivqk" rel="noreferrer">1</a>), (<a href="https://www.youtube.com/watch?v=M0kn_1oIP9Q" rel="noreferrer">2</a>), (<a href="https://www.youtube.com/watch?v=LBetTzIKaXI" rel="noreferrer">3</a>)</em>.  </p>
  
Answers.ContentLicense: CC BY-SA 4.0
Answers.CreationDate: 2018-08-01T13:18:37.000Z
Answers.Text: I guess only very new trains have this since my 10508 Deluxe Train Set V110 doesn't have the sensor. Does anyone know which train set has the sensor?
Answers.UserDisplayName: Nghia Hang
Answers.ContentLicense: CC BY-SA 4.0
Answers.CreationDate: 2018-08-01T16:35:38.077Z
Answers.Text: I personally don't own any DUPLO sets, so I'm just using the internet to do the friendly research.  If we have a train set in question, double check with the box art. LEGO's box art calls these funky bricks "Action Bricks".  If the box art doesn't promote the Action Brick and Interactive App feature, then it's most likely a no go.
Answers.UserDisplayName: Rin Rio-Oki
Answers.ContentLicense: CC BY-SA 4.0
Answers.CreationDate: 2018-08-01T16:57:03.287Z
Answers.Text: The sensor equipped trains are sets  10874-1 and 10875-1.  This group's common set series begin with "108", so it looks like any DUPLO train set that starts with 108 seems compatible, so far...  Rest of the sets I see that have no Sensor Train,but the funky Action Bricks are 10872-1 and 10882-1.
Answers.UserDisplayName: Rin Rio-Oki
Answers.ContentLicense: CC BY-SA 4.0
Answers.CreationDate: 2018-07-14T15:27:50.503Z
Answers.LastActivityDate: 2018-07-14T15:27:50.503Z
Answers.UserDisplayName: Rin Rio-Oki
Body: <p><a href="https://i.sstatic.net/Yo2Bw.jpg" rel="noreferrer"><img src="https://i.sstatic.net/Yo2Bw.jpg" alt="#6225519"></a></p>
  
  <p>Can someone explain to me what <a href="https://rebrickable.com/parts/38507/rail-accessory-no-4/4/" rel="noreferrer">38507: RAIL ACCESSORY, NO. 4</a> (#6225519) is for? I've got this in the new  <a href="https://brickset.com/inventories/10882-1/rebrickable" rel="noreferrer">Duplo Train accessory #10882</a> and can't figure out what it does :S</p>
  
Comments.ContentLicense: CC BY-SA 4.0
Comments.CreationDate: 2020-06-19T18:19:19.260Z
Comments.Text: Does this answer your question? [How does the DUPLO Action Bricks work?](https://bricks.stackexchange.com/questions/10907/how-does-the-duplo-action-bricks-work)
Comments.UserDisplayName: Robert Columbia
Tags: <piece-information><trains><duplo>
Title: What is the function of Duplo part# 38507 RAIL ACCESSORY, NO. 4
UserDisplayName: Nghia Hang
ThreadText: # What is the function of Duplo part# 38507 RAIL ACCESSORY, NO. 4
  
  (Asked by: username_0 on 2018-07-14)
  
  [![#6225519](https://i.sstatic.net/Yo2Bw.jpg)](https://i.sstatic.net/Yo2Bw.jpg)
  
  Can someone explain to me what [38507: RAIL ACCESSORY, NO. 4](https://rebrickable.com/parts/38507/rail-accessory-no-4/4/) (#6225519) is for? I've got this in the new [Duplo Train accessory #10882](https://brickset.com/inventories/10882-1/rebrickable) and can't figure out what it does :S
  
  **Tags:** piece-information, trains, duplo
  > **Comments:**
  > **username_1**: Does this answer your question? [How does the DUPLO Action Bricks work?](https://bricks.stackexchange.com/questions/10907/how-does-the-duplo-action-bricks-work)  
  
  ---
  
  ## 1 answers
  
  ### Answer by username_2 on 2018-07-14. Score: 10
  
  [![enter image description here](https://i.sstatic.net/46OSA.jpg)](https://i.sstatic.net/46OSA.jpg)
  It's an interactive piece that makes the train perform a cool(ish) function when it rolls over it.
  
  [![enter image description here](https://i.sstatic.net/f4vDj.jpg)](https://i.sstatic.net/f4vDj.jpg)
  The train has a sensor on the bottom that reads the piece and does the deed.
  
  [![enter image description here](https://i.sstatic.net/dtBj6.jpg)](https://i.sstatic.net/dtBj6.jpg)
  When the train reads this red one... it stops moving, which is sorta coolish for a jealous older sibling maybe ;).
  
  [![enter image description here](https://i.sstatic.net/xe0K3.jpg)](https://i.sstatic.net/xe0K3.jpg)
  Watch 3 videos explaining all the cool possibilities. *([1](https://www.youtube.com/watch?v=p8O62jIivqk)), ([2](https://www.youtube.com/watch?v=M0kn_1oIP9Q)), ([3](https://www.youtube.com/watch?v=LBetTzIKaXI))*.
  
  > **Comments:**
  > **username_0**: I guess only very new trains have this since my 10508 Deluxe Train Set V110 doesn't have the sensor. Does anyone know which train set has the sensor?  
  > **username_2**: I personally don't own any DUPLO sets, so I'm just using the internet to do the friendly research.  If we have a train set in question, double check with the box art. LEGO's box art calls these funky bricks "Action Bricks".  If the box art doesn't promote the Action Brick and Interactive App feature, then it's most likely a no go.  
  > **username_2**: The sensor equipped trains are sets  10874-1 and 10875-1.  This group's common set series begin with "108", so it looks like any DUPLO train set that starts with 108 seems compatible, so far...  Rest of the sets I see that have no Sensor Train,but the funky Action Bricks are 10872-1 and 10882-1.  
  
  ---
  
  