Saturday, April 4, 2020

Model Brake Component Size Comparison to Prototype

Model Brake Component Size To Westinghouse Brake Component Size Comparison

By George Toman
Photos by Lester Breuer

I measured the Tichy Train Group (Tichy),  Cal-Sale and Precision Scale model brake components to compare to prototype parts measurements from a 1951 Westinghouse Freight Car Brake Equipment document.

Tichy Train Group brake gear.
(Click on this or any photo to enlarge.)

Cal-Scale brake gear measured.

Precision Scale brake parts measured.

Westinghouse Air Brake Company booklet
George obtained prototype brake component measurements.

 George’s measurements made with a Digital Dial Caliper are as follows:

                    AB Valve                                    Reservoir                                 Brake Cylinder

Prototype     Length = 22 1/4 in.                 Length    = 41 1/8 in.               Length    = 27 3/16 in.
                    Height  = 13 3/4 in.                 Diameter = 18 7/8 in.              Diameter = 13 1/4 in.

Tichy            Length = 22.9 in.                    Length    = 37.5 in.                  Length    = 26.5 in.
                     Height  = 10.8 in.                   Diameter = 18.26 in.                Diameter = 13.8 in.

Cal-Scale      Length = 26 in.                       Length    = 43 in.                     Length     = 26.5 in.
                     Height  = 11.2 in.                    Diameter = 21.5 in.                  Diameter = 15.5 in.

Precision                                                      Length    = 43 in.
Scale                                                            Diameter = 21 in.

Based on these measurements I have concluded the 1951 specs are closest to Tichy Train Group brake components.  The specs I was given by someone,  I do not remember who, gave me larger specs for the reservoir  leading me to think that the Precision or Cal-Scale components would be the closest.  However, based on my findings, I guess I will continue to use Tichy brake components until proven otherwise.

My measurements may be off by a factor of .010 as it often depends where you measure the part, but I was surprised at the results based upon the official drawings.

George Toman

Thank You George for sharing the above brake component data you compiled.

Thank You for taking time to read my blog.  You can share a comment in the section below if you choose to do so.  Please share the blog link with other model railroaders.
Lester Breuer

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