Dynamic envelopes can be used as a reinforcement to keep traffic away from flashing lights and gate arms when trains are crossing an intersection. Regular envelopes work for a sample clip of a type of vegetation, but nothing can keep shrubs, weeds and trees away from the track when they are in their natural element. This is why vegetation management is a critical operation to help systems run smoothly on and around the track. Below is a summary of some of the equipment, herbicides and systems available to railroad companies.
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