Great Western Railway telegraphic codes
... that more than 900 different Great Western Railway telegraphic codes were in use to make the GWR's telegraph messages more efficient?
... that more than 900 different <b id="mwFGU"><a href="./Great_Western_Railway_telegraphic_codes" id="mwFGY" rel="mw:WikiLink" title="Great Western Railway telegraphic codes">Great Western Railway telegraphic codes</a></b> were in use to make the <a href="./Great_Western_Railway" id="mwFGc" rel="mw:WikiLink" title="Great Western Railway">GWR</a>'s <a href="./Electrical_telegraph" id="mwFGg" rel="mw:WikiLink" title="Electrical telegraph">telegraph</a> messages more efficient?