This page has been validated.
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 | ||
