Your citation for Mameda illustrates the problem You merely provided a link to the Japanese Wikipedia page that describes Mameda town today You did not establish that this reading was used 1 locally 2 at the time when the tramway operated and 3 by the tramway operator It was not uncommon to find localities and businesses which used local pronunciations readings of place names This practice has faded but has by no means disappeared in virtual defiance of Tokyo based authorities Kyoto clings to Kyoto ben pronunciations of certain well known place names Thus might well have been Mameda It might also have been Mameta This being a Kyushu place name it might also have been Mameden Zuden and T den are as is said unlikely but not impossible