With no explanation, label text_A→text_B with either "not_related" or "related".
text_A: Connaught Tunnel is incapable of being an underground passageway.
text_B: Drummond station served Drummond in County Londonderry in Northern Ireland .. Drummond. Drummond, County Londonderry. County Londonderry. County Londonderry. Northern Ireland. Northern Ireland. The Londonderry and Coleraine Railway opened the station on 1 July 1855 , on a short horse-drawn tram from station .. Londonderry and Coleraine Railway. Londonderry and Coleraine Railway. It closed on 1 October 1855 .
not_related.