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Bearings make a difference.

 

Two boxcars of identical weight and construction. The reddish brown car uses my previously preferred truck style of metal tubing with lubrication to cary the axle.

 

flic.kr/p/78ftrs

 

The dark blue box car uses bearings. Credit to Andrew for finding the bearings.

 

flic.kr/p/LsjFmT

 

I think it's clear. Bearings are good.

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Uploaded on August 27, 2016