I have one of these made by the American sounding company Westinghouse Brake and Signal Co. Ltd. . Its the 4" square thing on the bulkhead under the bonnet of a Bond or Gordon - I do have an idea that it does AC/DC things ( don't we all luvvy ) but how would I check if it might be in working order ? No running car to check it on I have a spare and a fellow forum dweller needs one
