Answers.Body: <p>It turns out the locomotive unit itself must have been faulty. I returned the entire set for a full refund and ordered a new one, and the locomotive from the new set performs the expected action when it passes over the blue brick.</p>
  <p>I’m glad I went to the effort because the action triggered by the blue brick is probably the most interesting of all of them.</p>
  
Answers.ContentLicense: CC BY-SA 4.0
Answers.CreationDate: 2024-03-13T10:26:16.190Z
Answers.LastActivityDate: 2024-03-13T10:26:16.190Z
Answers.UserDisplayName: Adam Ralph
Body: <p>I bought my daughter <a href="https://www.lego.com/en-ch/product/cargo-train-10875" rel="nofollow noreferrer">Cargo Train 10875</a> and it all works OK with one exception—the blue action brick has no effect. The other action bricks all have some noticeable effect.</p>
  <p>I asked LEGO to send me a replacement blue action brick, and they did, but the new brick doesn't have any effect either.</p>
  <p>Has anyone else had this problem? I'm wondering if the train itself is defective.</p>
  
Comments.ContentLicense: CC BY-SA 4.0
Comments.CreationDate: 2024-01-23T20:09:00.603Z
Comments.Text: Does this answer your question? [How do the DUPLO Action Bricks work?](https://bricks.stackexchange.com/questions/10907/how-do-the-duplo-action-bricks-work)
Comments.UserDisplayName: IvanSanchez
Comments.ContentLicense: CC BY-SA 4.0
Comments.CreationDate: 2024-01-23T20:09:48.213Z
Comments.Text: Try cleaning the light sensor on the bottom of the locomotive.
Comments.UserDisplayName: IvanSanchez
Comments.ContentLicense: CC BY-SA 4.0
Comments.CreationDate: 2024-01-27T10:58:10.810Z
Comments.Text: Well, if sensor cleaning does not change behaviour for blue colored action brick I would suggest getting in touch with LEGO Customer Service again asking for locomotive base replacement. It might be that the unit itself has some issues.
Comments.UserDisplayName: Alex
Comments.ContentLicense: CC BY-SA 4.0
Comments.CreationDate: 2024-01-28T13:30:59.080Z
Comments.Text: I cleaned the light sensor on the bottom of the locomotive, but it made no difference. I will contact LEGO about replacing the locomotive.
Comments.UserDisplayName: Adam Ralph
Tags: <trains><duplo><sensor-colour>
Title: DUPLO cargo train 10875 blue action brick has no effect
UserDisplayName: Adam Ralph
ThreadText: # DUPLO cargo train 10875 blue action brick has no effect
  
  (Asked by: username_0 on 2024-01-23)
  
  I bought my daughter [Cargo Train 10875](https://www.lego.com/en-ch/product/cargo-train-10875) and it all works OK with one exception—the blue action brick has no effect. The other action bricks all have some noticeable effect.
  
  I asked LEGO to send me a replacement blue action brick, and they did, but the new brick doesn't have any effect either.
  
  Has anyone else had this problem? I'm wondering if the train itself is defective.
  
  **Tags:** trains, duplo, sensor-colour
  > **Comments:**
  > **username_1**: Does this answer your question? [How do the DUPLO Action Bricks work?](https://bricks.stackexchange.com/questions/10907/how-do-the-duplo-action-bricks-work)  
  > **username_1**: Try cleaning the light sensor on the bottom of the locomotive.  
  > **username_2**: Well, if sensor cleaning does not change behaviour for blue colored action brick I would suggest getting in touch with LEGO Customer Service again asking for locomotive base replacement. It might be that the unit itself has some issues.  
  > **username_0**: I cleaned the light sensor on the bottom of the locomotive, but it made no difference. I will contact LEGO about replacing the locomotive.  
  
  ---
  
  ## 1 answers
  
  ### Answer by username_0 on 2024-03-13. Score: 2 | Accepted answer
  
  It turns out the locomotive unit itself must have been faulty. I returned the entire set for a full refund and ordered a new one, and the locomotive from the new set performs the expected action when it passes over the blue brick.
  
  I’m glad I went to the effort because the action triggered by the blue brick is probably the most interesting of all of them.
  
  
  ---
  
  