Answers.Body: <p>The rails with the &quot;small teeth&quot; are</p>
  <p><a href="https://www.bricklink.com/v2/catalog/catalogitem.page?P=3230a#T=C" rel="noreferrer">Part No: 3230a ,  Train, Track Tapered Rail Curved Inside</a></p>
  <p><a href="https://www.bricklink.com/v2/catalog/catalogitem.page?P=3229a#T=C" rel="noreferrer">Part No: 3229a Name: Train, Track Tapered Rail Curved Outside</a></p>
  <p><a href="https://www.bricklink.com/v2/catalog/catalogitem.page?P=3228a#T=C" rel="noreferrer">Part No: 3228a Name: Train, Track Tapered Rail Straight 16L</a></p>
  
Answers.ContentLicense: CC BY-SA 4.0
Answers.CreationDate: 2020-09-30T15:24:01.510Z
Answers.Text: OK - Thanks Syberion.
Answers.UserDisplayName: Norm W.
Answers.ContentLicense: CC BY-SA 4.0
Answers.CreationDate: 2020-09-27T17:06:50.737Z
Answers.LastActivityDate: 2020-09-27T17:06:50.737Z
Answers.UserDisplayName: Syberion
Body: <p>I have acquired several large bags of LEGO - most are the tradition bricks, but what kit are these (see photo) rail-type pieces from? They are identified on the reverse with a letter, such as &quot;E&quot;, and a 1 or 2-digit number. Some of the rails contain small teeth the entire length - some are smooth.</p>
  <p><a href="https://i.sstatic.net/q2NlC.jpg" rel="nofollow noreferrer"><img src="https://i.sstatic.net/q2NlC.jpg" alt="enter image description here" /></a></p>
  
Comments.ContentLicense: CC BY-SA 4.0
Comments.CreationDate: 2020-09-27T18:50:25.313Z
Comments.Text: Related: [What different types of train tracks exist](https://bricks.stackexchange.com/q/2885/10369)
Comments.UserDisplayName: Uli
Comments.ContentLicense: CC BY-SA 4.0
Comments.CreationDate: 2020-09-29T14:32:13.113Z
Comments.Text: That gear doesn't look like Lego at all. But those rails where the normal rails in the 70's
Comments.UserDisplayName: Tonny
Comments.ContentLicense: CC BY-SA 4.0
Comments.CreationDate: 2020-10-02T21:51:01.007Z
Comments.Text: @Tonny , The gear is [part # 743 :Technic, Gear Samsonite 35 Tooth](https://www.bricklink.com/v2/catalog/catalogitem.page?P=743#T=C&C=7)
Comments.UserDisplayName: Syberion
Comments.ContentLicense: CC BY-SA 4.0
Comments.CreationDate: 2020-10-03T11:57:00.810Z
Comments.Text: @Syberion Interresting... The early Technic gears I'm familiar with are from the 70's. The red (small) , blue (medium) and yellow (big) ones with the white axles. Seems these are even bigger. I had never seen them before.
Comments.UserDisplayName: Tonny
Tags: <part-identification>
Title: What are these "rail-style" LEGO pieces?
UserDisplayName: Norm W.
ThreadText: # What are these "rail-style" LEGO pieces?
  
  (Asked by: username_0 on 2020-09-27)
  
  I have acquired several large bags of LEGO - most are the tradition bricks, but what kit are these (see photo) rail-type pieces from? They are identified on the reverse with a letter, such as "E", and a 1 or 2-digit number. Some of the rails contain small teeth the entire length - some are smooth.
  
  [![enter image description here](https://i.sstatic.net/q2NlC.jpg)](https://i.sstatic.net/q2NlC.jpg)
  
  **Tags:** part-identification
  > **Comments:**
  > **username_1**: Related: [What different types of train tracks exist](https://bricks.stackexchange.com/q/2885/10369)  
  > **username_2**: That gear doesn't look like Lego at all. But those rails where the normal rails in the 70's  
  > **username_3**: @Tonny , The gear is [part # 743 :Technic, Gear Samsonite 35 Tooth](https://www.bricklink.com/v2/catalog/catalogitem.page?P=743#T=C&C=7)  
  > **username_2**: @Syberion Interresting... The early Technic gears I'm familiar with are from the 70's. The red (small) , blue (medium) and yellow (big) ones with the white axles. Seems these are even bigger. I had never seen them before.  
  
  ---
  
  ## 1 answers
  
  ### Answer by username_3 on 2020-09-27. Score: 6 | Accepted answer
  
  The rails with the "small teeth" are
  
  [Part No: 3230a , Train, Track Tapered Rail Curved Inside](https://www.bricklink.com/v2/catalog/catalogitem.page?P=3230a#T=C)
  
  [Part No: 3229a Name: Train, Track Tapered Rail Curved Outside](https://www.bricklink.com/v2/catalog/catalogitem.page?P=3229a#T=C)
  
  [Part No: 3228a Name: Train, Track Tapered Rail Straight 16L](https://www.bricklink.com/v2/catalog/catalogitem.page?P=3228a#T=C)
  
  > **Comments:**
  > **username_0**: OK - Thanks Syberion.  
  
  ---
  
  