Only wording I can find is on the burner adjuster - Sherwoods Birmingham - see Pictures. I cannot see a Railway reference but all searching so far suggests that it would be railway related. OVERSEAS INTEREST?.
1945 C. Eastgate and Sons Birmingham MOD Railway Lantern with burner
L N E Railway Lantern Part Mobilite Sherwood Birmingham Ceramic Wick Burner Only
SHERWOODS LIMITED! Railway Signal Lamp/ BRM/LYNLIGHT NUMBER ONE BRITISH MAKE
Vintage Railway Lantern Candle Holder Floor Table Lantern | Home Decor
