49 C.F.R. § 236.824
System, automatic block signal.
Cite as 49 C.F.R. § 236.824 (2026)
A block signal system wherein the use of each block is governed by an automatic block signal, cab signal, or both.
49 C.F.R. § 236.824
Cite as 49 C.F.R. § 236.824 (2026)