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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 |