Relay, Maryland, or Relay House, Maryland, was formerly an important junction and rail stop on the Baltimore and Ohio Railroad, located 9 miles (14 km) west of Baltimore, Maryland. It was the busiest station on the line except for Baltimore itself. A town grew up around it: a general store, a school, and a volunteer fire company. Although the neighborhood is still inhabited, only the ghost of the town survives. There is no longer town government, a post office, nor are there any stores. The former fire house, at 1710 Arlington Avenue, at one point the town hall, has survived and is available for rental for events. In 2021 Relay is a historic district of Halethorpe, Maryland, near the intersection of today's Viaduct and Railroad Avenues. There is a Relay Elementary School.