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!

When You Need To Super-Elevate Track For Trains Moving Through A Curve At Speed

Super-elevation on real railroads is when the outer rail of the track is elevated so as to compensate the centrifugal forces that happen when a train passes through a curve at speed. Sound complicated? Let me explain it another way.

super-elevation train track

Super elevation is basically the difference in elevation (height) between the two edges of railway track (or a road). It is normally seen where the railroad (or road) has a curve; raising the outer rail (or the outer edge of the road) to provide a banked turn. This allows a train (or vehicle on a road) to traverse the curve at a higher speed than would otherwise be possible.

 

super elevation trains on curve tracks

 

Having such a system neutralizes the effect of lateral force. It provides better load distribution on the two rails and reduces wear and tear of rails and rolling stock. In addition it provides smooth running of trains (and more comfort for passengers), and if designed and operated correctly, should result in fewer derailments.

However, excessive elevation in curves can increase the risk of derailment. When running significantly under balance speed, or operating on over-elevated curves, a significant portion of the vertical weight of the car is transferred to the low rail. The wheels can lift off the higher rail.

The following diagram provides a good perspective on the process of super elevation on a real railroad. Super-elevation should happen gradually as the train proceeds over the length of the track entering the curve (entry easement). Maximum super elevation would be reached when the train is into the curve. The train would then ease back down to level as it comes out of the curve and proceeds along the length of track exiting the curve (exit easement). Following this process, the train is able to stay at speed whilst navigating the entire curve.

Superelevation should happen gradually

A smooth transition from a tangent to curve

super elevation trains model railroadsThat’s how the system works in the real world, so modeling the same process on a model railroad makes sense as it will add impressive realism to train operations.

Unfortunately it is something that is often over-looked at the planning stage, or put in the “too hard basket” during construction. Fact is; the process is not that difficult.

The way most hobbyists tackle it is to use strips of basswood, or something similar, and lay a series of splines along the outer curve edge. Sanding the transition into the super elevation can be somewhat time-consuming, so the following should help to simplify the process.

3 Responses to When You Need To Super-Elevate Track For Trains Moving Through A Curve At Speed

  • Howard Blasczyksays:

    Keep in mind that you are working in scale. Even a small change can make a difference.
    A 1/8 inch elevation of the outer rail in HO scale would be almost 1/2 foot on an actual RR.

    Although super-elevating during construction may be preferable, it can be done after construction. You may not be aware of where the problem areas are until you actually run trains. It is however preferable to add the shims prior to ballasting.

  • Doug Sassmansays:

    Doug Sassman/says

    On the bottom side of of the curve use smaller code rail—–(example)out side rail code 100 inside rail code 80——-

  • Bobsays:

    I think the key to addressing any super-elevation concern is the speed one would want to achieve through the curve. Really now, how many layouts are large enough to run trains at high speeds and not look like the typical toy train in the shop window racing around the loop every few seconds?

    It’s commonly recognized that, for most layouts, attention to the easements into and out of the curves produces quite an improvement over the typical abrupt entry into or out of a fixed-radius track section. I would suggest spending time on super-elevation only after getting the easements right.

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)

Use Tiny Railroad Micro Controllers

Model Train DCC HELP

N Scale Track Plans

Watch Video

Model Train Help Ebook

Download Your Free Catalog



















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?

Model Railroad Building House Plans

rail yard buildings

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.