relay post-horse mail service (in former times)

see 驛城區|驿城区[Yi4 cheng2 Qu1]

relay station for post horses (old)

post horse

Yicheng, a district of Zhumadian City 駐馬店市|驻马店市[Zhu4 ma3 dian4 Shi4], Henan

relay (electronics)

see 龍泉驛區|龙泉驿区[Long2 quan2 yi4 Qu1]