What is the Minimum Curve Radius for Model Trains?

"O gauge" refers to tracks that are 1.25 in (31.75 mm) apart

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Brasseur Electric Trains - Over 12,000 Model Train Parts ...

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Polar Express only runs in reverse ' O Gauge Railroading ...

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Dec 7, 2011 - Polar Express only runs in reverse ... At this time of the year all Polar Express trains are programmed to run North only. ... This would not be so bad on the Strasburg set because half the time, the prototype runs in reverse.

both trains only go backward - Classic Toy Trains Magazine

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... trains that i set up around Christmas. The first train, according to the box, is a k-line 0/027 gauge dual motor mp-15. For a long time it has only run backwards.

no forward only reverse - Model Train Forum - the complete model ...

www.modeltrainforum.com > Scale Specific Model Train Forum > O Scale

Oct 18, 2009 - 10 posts - ‎3 authors
There are two switches under the cab; they have no effect on forward motion. This setis 2 or 3 years old and has been run maybe 1 hour total. New Athearn HO Locomotive won't go in reverse ...
9 posts
Mar 5, 2015
Lionel Rio Grande 8213 only runs in reverse - Model ...
10 posts
Nov 18, 2013
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You may need smaller covers so the inserts work. Generally, they should go in gently, then with a slight twist, fit snugly. If the pads are too big, you'll never get a comfortable fit.

see attached pdf, page 4.
http://www.lionel.com/media/servicedocuments/70-5121-250.pdf

Base Curve radius

The maximum value of the sine function is positive one, the minimum value is negative one. Within any limited range the maximum and minimum will fall between the two extremes.
If you have a graphing calculator, the easiest way to to find the maximum and minimum values of a sine curve is to plot it. Some calculators will even automatically find the max and min values. Others you'll have to eyeball it.
If you don't have a graphing calculator, you can calculate the value at a series of points and hone in the max and min values.
If you need further assistance, please reply to this post and specify the make and model of your calculator.

Check to see if the train is lifting off the track on the curve and the roller is not making contact with the center rail. Run the engine alone slowly and try both forward and backward.

http://cs.trains.com/TRCCS/forums/t/195035.aspx

Well you should probably check the radius of your curves. The Hogwarts Express has a minimum curve of O36 and on a tighter radius curve it will derail. I have found that the Hogwarts train runs better on fasttrack than standard O. You should also make sure the track is flat because if it isn't completely flat it derails. The train isn't designed well so it derails but if you run it slow you shouldn't have a lot of problems.