Scale Car

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What is a scale test car? How does it work?

I noticed a little rail car that was being pulled around the yard, after it uncupled from a long pull on a Mail #9 trailer train. The car was a scale test car. Why was it on a train right behind the three lead locomotives? How does it work, and what is it testing ?

Dave is right. It is a car of known weight and when calibrating scales, either standard scales or “coupled in motion” scales, it is used either standing, uncoupled or in a train moving over the scale, knowing how much it weighs will tell how much inaccuracy (if any) is in the scale being calibrated.

The reason why it was entrained on the head end is that these are extremely heavy cars, made all the more precarious owing to a shorter wheelbase. Further back in the train it’d be like swinging a sock around with a rock in it. It will dramatically alter the slack action and you do not want it on the rear.

It is the same for transporting locomotives “DIC” (dead in consist). Here there are air concerns as well, but you don’t want the 200 tons banging around back in the train. Some older locomotives are moved “dead in train.” Usually smaller engines, like old switchers, lack a “dead engine” feature in the air box. So, these needed to be entrained near the rear, because of air brake operation. Being older and smaller, as a rule, they are near the weight of a standard loaded 140 ton car today. So, it’s just another freight car, in reality.

In addition, these older engines don’t have a “coupler stop” that is used for road moves on engines like the SW1500. Being switchers, the arc of the swing of the drawbar in the coupler pocket is much wider than what a road engine will allow. The reason is simple in that industrial tracks usually come complete with super tight radii. The extra swing is necessary. The coupler stops restrict this movement, which would be extreme in road movements. In addition, whenever possible, these locomotives will not be found as the trailing unit in the consist.

I am curious myself as to how often scales need to be calibrated.

Anybody know?

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