The yellow arms signify 'distant' or 'caution', and are seen prior to signals with red arms. Signals for manual operation only.
Hornby R172 Single Distant Signal OO Gauge
Hornby R172 "SINGLE DISTANT SIGNAL" OO/ H0 Gauge
2x Hornby R172 Single Distant Signal Carded But Used OO Gauge Model Railway
BNIB OO Gauge Hornby R172 Single Distant Signal
Hornby R172 Single Distant Signal