B61L—GUIDING RAILWAY TRAFFIC; ENSURING THE SAFETY OF RAILWAY TRAFFIC
B61L5/00—Local operating mechanisms for points or track-mounted scotch-blocks; Visible or audible signals; Local operating mechanisms for visible or audible signals
B61L5/12—Visible signals
B61L5/18—Light signals; Mechanisms associated therewith, e.g. blinders
B61L5/1809—Daylight signals
B61L5/1818—Daylight signals using mobile coloured screen