Clinch Valley Division CV 464.01 over Clear Creek, Norton vicinity, Wise County, VA

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Is it possible the superstructure was rebuilt in 1939 and yet this information may not have been included within the archived records. However I also wonder why an existing bridge would need replacement after only 20 years of service?
 
Any advice, thought or suggestion would be appreciated.  Thank you for your time.
Joe-
 
Ballasted deck trestles were a rarity on the N&W .  This type of span had an advantage--
it used common, everyday cross ties. Steel spans required cut to order bridge ties. The
ballasted deck trestle had a huge disadvantage -- failure to drain properly.  Although
Atlantic Coast Line (for one) had many ballasted deck trestles, N&W preferred steel spans.
After all, N&W could produce its own ties at the Radford plant.  After 20 years of service,
the bridge at Clear Creek may have begun to show the results of poor drainage--
accumulating weight on the concrete slabs,  piers settling, etc.         Harry Bundy

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