You can push the tab above the handle to rotate the inner glass shade portion to either no color (open), blue, or red.
Great Northern Railway pattern signal lamp interior Peterborough North
GREAT NORTHERN RAILWAY Red ADLAKE RAILROAD LANTERN GNRY Oil Lamp Working Antique
GWR 1932 Railway 3 way signal lamp. Railwayana. Great western railway lamp.
1922 Great Eastern Railway & Great Northern Railway Maldon Grantham Memos (2)
MIDLAND & GREAT NORTHERN RAILWAY (M&GNJR) Luggage Label GREAT ORMESBY #146
c1880s Great Eastern & Great Northern Railway Paperwork GNR
