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Our Baldwin #21 at work
Baldwin #21
SP&S #273
Astoria RR
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Rebuilding the Lead Truck

Rebuilding the Lead Truck

Saturday, September 5, 2009 by John Niemann

Here is a close-up of #21's blueprint showing the front truck as originally planned. The two 9" long heart shaped arms hanging down are the "rockers". You can see that they are each hung on the top by a pair of pins. As the front truck enters a curve, the axle and frame move laterally causing the rockers to rotate about their lower pins. When this happens, all the weight is instantaneously transfered to a single top pin, shifting the center of gravity 3" off the centerline of the truck. This "off-center imbalance" imparts a desire in the truck to return to center and straighten out.

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Astoria Railroad Preservation Association
P.O. Box 541
446 W. Marine Dr.
Astoria, Oregon 97103
(503) 325-5323

An Educational Non-Profit Corporation
Dedicated to Promoting Public Awareness of Railroad History
Through the Preservation and Operation of Vintage Railway Equipment.

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