Here you have some results with different software for the transformation of one single UTM 31N ED50 coordinate to lon,lat ED50 and lon,lat WGS84. My understanding of this problem seems to be decreasing as I do more testing.
QGIS UTM 31N ED50 POINT(449919.586269 4631874.109627) TRANSFORMS TO LONGITUDE,LATITUDE: QGIS ED50 POINT(2.396864 41.836439) QGIS WGS84 POINT(2.396864 41.836439) GlobalMapper ED50 2.39686371° E 41.83643863° N GlobalMapper WGS84 2.39572870° E 41.83535625° N TNT WGS84 POINT(2.396864 41.836439) TNT ED50 POINT(2.396864 41.836439) rgdal ED50 no towgs84 field specified WP1 2.39686370617169 41.8364386271064 rgdal WGS84 no towgs84 field specified WP1 2.39686370617169 41.8364386271064 rgdal WGS84 with towgs84=-87, -98,-121 WP1 2.39690750837097 41.8361433350555 Agus
begin:vcard fn:Agustin Lobo n:Lobo;Agustin org:Institut de Ciencies de la Terra "Jaume Almera" CSIC adr:;;Lluis Sole Sabris s/n;Barcelona;;08028;Spain email;internet:agustin.l...@ija.csic.es url:http://www.ija.csic.es/gt/obster version:2.1 end:vcard
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