Answers.Body: <p>It's more or less obvious that tracks themselves are compatible, although blue rails won't go on dark gray sleepers, which isn't really a problem. You may want to use more sleepers under blue tracks to stabilise it, although the 12v inserts help. Mixing blue and grey track and inserts shouldn't be a problem, should you wish to do so. </p>
  
  <p>Motors are also compatible and pick up power the exact same way. Cables use the same connectors and are thus compatible too (if you want to add lighting to your trains).</p>
  
  <p>As for accessories, I can't be sure but I believe there are limitations. If you look at the <a href="http://www.brickset.com/detail/?Set=740-2" rel="nofollow noreferrer">blue transformer</a>, you'll notice the output to remote control the switch is 16v AC, while grey era remotes use 12v DC. Feeding 12v remotes with 16v might work (it's just an electromagnet inside and shouldn't be exposed for too long), if the blue era remotes need 16v, they may not work with only 12v.</p>
  
  <p>Moreover, the wiring is also different: 12v era remotes use a standard cable, and the polarity determines the direction you want to turn it, but the blue era points use a 3-wire cable, as evidence by this <a href="http://www.bricklink.com/catalogItemInv.asp?S=708-1" rel="nofollow noreferrer">extension cable</a>. And let's not forget the difference AC/DC, which mean you'll have to add some non-LEGO components to make it work.</p>
  
  <p>In short, I think controlling 12v era remotes with the blue transformer should be easy (a couple of diodes should do the trick), but the opposite might prove tricky, and if you have blue points, you may want to get a blue transformer as well. (Then again, I don't know enough about electronics to know how tricky it would be).</p>
  
  <p>A small caveat though: I assumed you have the blue point without the remotes themselves, but since they were sold together, it could be that you get the point, wiring and remote together. If that's so, you best bet is to use the <a href="https://bricks.stackexchange.com/questions/1549">12v AC output</a> of the 7864 transformer - maybe that's its purpose (and if you try that, and it works, please go answer that question).</p>
  
Answers.ContentLicense: CC BY-SA 3.0
Answers.CreationDate: 2012-12-06T08:19:33.843Z
Answers.Text: Thanks for covering all the aspects (tracks, motors, remotes).
Answers.UserDisplayName: wap26
Answers.ContentLicense: CC BY-SA 3.0
Answers.CreationDate: 2012-12-05T17:28:50.057Z
Answers.LastActivityDate: 2012-12-05T17:28:50.057Z
Answers.LastEditDate: 2017-04-13T12:47:56.213Z
Answers.UserDisplayName: Joubarc
Answers.Body: <p>The answer is yes.</p>
  <p>Using the 13v~ (alternate) output of the grey line transformer you can command the blue line switches.</p>
  <p>This is not in the manual of the new transformer (it is a kind of hidden door to the past) and the blue line transformer switches output was 16v~, but I've tried it and it works.</p>
  
Answers.ContentLicense: CC BY-SA 4.0
Answers.CreationDate: 2020-07-20T16:06:42.707Z
Answers.LastActivityDate: 2020-07-20T16:06:42.707Z
Answers.UserDisplayName: Pedro Quaresma
Answers.Body: <p>I just got some blue era stuff.  I'm going to try and see what happens, but the grey era Transformer has >13V output and I think that is legacy for the blue track stuff.  So that you can plug in switches to there (until now I've wondered what on earth that output is for!!)</p>
  
Answers.ContentLicense: CC BY-SA 4.0
Answers.CreationDate: 2020-07-20T11:41:11.107Z
Answers.Text: Did you managed to discover the intended use for the 13V output? More important, did you discover if the blue train switch can be used with the gray transformer?
Answers.UserDisplayName: Pedro Quaresma
Answers.ContentLicense: CC BY-SA 4.0
Answers.CreationDate: 2020-07-20T13:16:49.203Z
Answers.Text: @PedroQuaresma I've moved your answer to a comment here, but this user has been inactive for several years, so you are unlikely to hear back from them. You might be better off asking a new question such as "Can the 13V output on the 7864 transformer be used to support blue-era points?"
Answers.UserDisplayName: jncraton
Answers.ContentLicense: CC BY-SA 3.0
Answers.CreationDate: 2016-06-30T12:57:41.403Z
Answers.LastActivityDate: 2016-06-30T13:36:12.040Z
Answers.LastEditDate: 2016-06-30T13:36:12.040Z
Answers.UserDisplayName: Breakdown
Body: <p>Are the two generations of 12v train compatible?</p>
  
  <p>Eg can you combine a <a href="http://www.brickset.com/detail/?Set=754-1">"blue" remote controlled point</a> and a <a href="http://www.brickset.com/detail/?Set=7864-1">"grey" 12v transformer</a>?</p>
  
  <p>Main motivation for this: I have a complete "grey" set of trains, tracks and accessories and "blue" items are much much cheaper on the re-sale market, so I'd rather buy additional "blue" items.</p>
  
Tags: <trains><compatibility><12v>
Title: Are the blue and grey 12v train system compatible?
UserDisplayName: wap26
ThreadText: # Are the blue and grey 12v train system compatible?
  
  (Asked by: username_0 on 2012-12-04)
  
  Are the two generations of 12v train compatible?
  
  Eg can you combine a ["blue" remote controlled point](http://www.brickset.com/detail/?Set=754-1) and a ["grey" 12v transformer](http://www.brickset.com/detail/?Set=7864-1)?
  
  Main motivation for this: I have a complete "grey" set of trains, tracks and accessories and "blue" items are much much cheaper on the re-sale market, so I'd rather buy additional "blue" items.
  
  **Tags:** trains, compatibility, 12v
  
  
  ---
  
  ## 3 answers
  
  ### Answer by username_1 on 2012-12-05. Score: 6 | Accepted answer
  
  It's more or less obvious that tracks themselves are compatible, although blue rails won't go on dark gray sleepers, which isn't really a problem. You may want to use more sleepers under blue tracks to stabilise it, although the 12v inserts help. Mixing blue and grey track and inserts shouldn't be a problem, should you wish to do so.
  
  Motors are also compatible and pick up power the exact same way. Cables use the same connectors and are thus compatible too (if you want to add lighting to your trains).
  
  As for accessories, I can't be sure but I believe there are limitations. If you look at the [blue transformer](http://www.brickset.com/detail/?Set=740-2), you'll notice the output to remote control the switch is 16v AC, while grey era remotes use 12v DC. Feeding 12v remotes with 16v might work (it's just an electromagnet inside and shouldn't be exposed for too long), if the blue era remotes need 16v, they may not work with only 12v.
  
  Moreover, the wiring is also different: 12v era remotes use a standard cable, and the polarity determines the direction you want to turn it, but the blue era points use a 3-wire cable, as evidence by this [extension cable](http://www.bricklink.com/catalogItemInv.asp?S=708-1). And let's not forget the difference AC/DC, which mean you'll have to add some non-LEGO components to make it work.
  
  In short, I think controlling 12v era remotes with the blue transformer should be easy (a couple of diodes should do the trick), but the opposite might prove tricky, and if you have blue points, you may want to get a blue transformer as well. (Then again, I don't know enough about electronics to know how tricky it would be).
  
  A small caveat though: I assumed you have the blue point without the remotes themselves, but since they were sold together, it could be that you get the point, wiring and remote together. If that's so, you best bet is to use the [12v AC output](https://bricks.stackexchange.com/questions/1549) of the 7864 transformer - maybe that's its purpose (and if you try that, and it works, please go answer that question).
  
  > **Comments:**
  > **username_0**: Thanks for covering all the aspects (tracks, motors, remotes).  
  
  ---
  
  ### Answer by username_2 on 2020-07-20. Score: 2
  
  The answer is yes.
  
  Using the 13v~ (alternate) output of the grey line transformer you can command the blue line switches.
  
  This is not in the manual of the new transformer (it is a kind of hidden door to the past) and the blue line transformer switches output was 16v~, but I've tried it and it works.
  
  
  ---
  
  ### Answer by username_3 on 2016-06-30. Score: 0
  
  I just got some blue era stuff. I'm going to try and see what happens, but the grey era Transformer has >13V output and I think that is legacy for the blue track stuff. So that you can plug in switches to there (until now I've wondered what on earth that output is for!!)
  
  > **Comments:**
  > **username_2**: Did you managed to discover the intended use for the 13V output? More important, did you discover if the blue train switch can be used with the gray transformer?  
  > **username_4**: @username_2 I've moved your answer to a comment here, but this user has been inactive for several years, so you are unlikely to hear back from them. You might be better off asking a new question such as "Can the 13V output on the 7864 transformer be used to support blue-era points?"  
  
  ---
  
  