Everything on model trains, model railroads, model railways, locomotives, model train layouts, scenery, wiring, DCC and more. Enjoy the world's best hobby... model railroading!

If You Want Truly Photo-Realistic Plans – You Won’t Find Better!

Reverse Loop Shorting Out

HO enthusiast David G asks readers this:

“I’m DCC – an NCE 5 amp. Am attempting to wire MRC auto reverse module. Loop returns back to main track thru set of points but shorts when points are set to left. Have isolated insulfrog point ends still same prob. One engine has enough weight to run thru without derailing when points straight ahead without derailing. Hookup cars won’t do same.”

You can submit your question to the Blog Moderator for publishing by clicking one of the several ASK A QUESTION links on this blog.

3 Responses to Reverse Loop Shorting Out

  • ROBERT SCHWORMsays:

    Have you examined your turnout on the bench just by itself? The reversing loop gets its power from the rail that feeds into the rails. These point ends do not need to be isolated. A few feet into the loop at the other ends of the turnout are track insulators on BOTH rails. There is a pair of insulators like this on both the straight and turnout ends of the turnout. The entire train must be inside the loop, that is when the engine crosses the gab, the caboose is inside the other gap . If the frog is insulated, then when checking the ends of the turnouts, each pair of rails is in common with the other branch, same for the other side. I am assuming that when the rails change polarity, the tortoise is getting power as well from the reverser and the it throws at the same time….in the appropriate direction. Again, check the turnout on the bench for proper polarity as the switch throws.

  • Kevin Chingsays:

    I am not sure about MRC but I know the digit track AR1 works with NCE controllers It sounds to me as though you do not have it wired up quite right We wired our up to an insulated section of the track that is able to take a whole lot of the engines in consist if you are running multi loco units.

  • Billsays:

    David;
    From everything I have seen and read on reversing loops you are looking for trouble if you run them through a turnout. Best practice is to terminate 6 inches (15 cm) before the turnout. Are you running any other reverse loops on your rail road. If this is the only one is it possible your problem is the booster tolerance time for a short is not long enough. I had that issue with my Digitrax system and fixed in no time with a minor programming change. I am not familiar with NCE systems so don’t know if this could apply to your system.
    Frustrating when these “Miracle Fixes” don’t work but usually is just a small issue we overlooked.
    Good Luck

Leave a Reply

Your email address will not be published. Required fields are marked *

Add a photo or image related to your comment (JPEG only)

Download Your Free Catalog

Use Tiny Railroad Micro Controllers

Model Railroad Building House Plans

rail yard buildings

Model Train DCC HELP

N Scale Track Plans

Watch Video

Model Train Help Ebook

Watch These Club Videos

Club members access helpful new resources each month: diagrams, video tutorials, articles, track plans and more. Watch the tour videos here.

Scenery Techniques Explained

NEW TO MODEL TRAINS?

SUBMIT YOUR QUESTION

Submit Your Model Railroading Questions!

Before you submit your model railroading question please add some feedback, answers or comments to other postings on this model train blog. What goes around comes around... so if you can help others in the hobby, someone else may help you.

Important - Please add plenty of supporting details to any question you submit (eg. scale, solutions you have already tried etc.) , as the clearest and best questions usually get the best answers. Also, please check your spelling and punctuation as all questions need to be approved by the blog moderator prior to publication. Approved questions are normally published within a week (if not sooner).

Submit your model train questions here.

Scenery & Layout Ideas

Submit Your Article

Would you like to write an article and have it published?

Preference will be given to articles that help others progress in the hobby, maybe suggesting an idea for their layout, a quick tip or two... or perhaps a little bit of good advice based on your model railroading experiences.

We are all in this hobby together, so the more we can do to share ideas and help each other, the better.

Submit Your Article Here

Model Railroading Blog Archive

Reader Poll

Sorry, there are no polls available at the moment.