Southern Railway Flaman locomotive SPEED INDICATOR/RECORDER with makers name on the front ATELIERS VAUCANSON SOUTHERN RAILWAY 46. Measures 12in wide x 17in tall and is in good condition with a crack to the top glass which could easily be replaced. As used by the Southern Railway in all of the Lord Nelson class locomotives. See Lord Nelson 4-6-0's by Richard Derry, published by Irwell Press page 22 for a full explanation.