Page:Library of Congress Classification Outline.djvu/283

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Subclass TF

TF1-1620 Railroad engineering and operation
TF200-320   Railway construction
TF340-499 Railway equipment and supplies
TF501-668 Railway operation and management
TF670-851 Local and light railways
TF840-851   Elevated railways and subways
TF855-1127 Electric railways
TF1300-1620 High speed ground transporation