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Rapid transit (Aetrd)

Definition
A transit system that uses steel wheeled passenger rail cars operating singly or in trains on fixed steel rails in exclusive rights of way in underground tunnels, on elevated structures, in open cuts, or at surface level with very few, if any, grade crossings (at which rail traffic has the right of way) using a third rail power source or overhead catenary and that generally serves one contiguous urban area. Sometimes referred to as Metro. (Source: AASHTO Glossary)
Use For
Heavy rail transit
Broader Term
Rail transit (Aetr)
Related Terms (Hierarchical)
Railroad commuter service (Aetrc)
Light rail transit (Aetrh)
Related Terms (Associative)