Hybrid rail is a transit mode classification used in the United States for passenger rail services that operate on the national rail network but do not comply with Federal Railroad Administration (FRA) Tier I crashworthiness standards. These systems operate under FRA waivers or through temporal separation from freight trains, allowing the use of lighter, non-compliant diesel multiple units (DMUs) similar to those used in light rail or commuter rail systems.
Hybrid rail is a transit mode classification used in the United States for passenger rail services that operate on the national rail network but do not comply with Federal Railroad Administration (FRA) Tier I crashworthiness standards. These systems operate under FRA waivers or through temporal separation from freight trains, allowing the use of lighter, non-compliant diesel multiple units (DMUs) similar to those used in light rail or commuter rail systems.
Source: Wikipedia "Hybrid rail" · CC BY-SA 4.0
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