disk signal

disk signal

[¦disk ¦sig·nəl]
(civil engineering)
Automatic block signal with colored disks that indicate train movements.
References in periodicals archive ?
The most common progressive findings were disk signal loss (10%), progressive facet arthrosis (10%), or increased end plate changes (4%).
Enabled by new heads and Komag disks that double the disk coercivity and strengthen disk signal amplitude, the PMR configuration will facilitate future disk capacity growth far beyond the current designs at 120 GB and 160 GB.