Captain Hayward
In June 1843 , because of difficulties with Dover harbour , the South Eastern Railway company developed Boulogne-sur-Mer-Folkestone route as an alternative to Calais-Dover . 
<triplet> Boulogne-sur-Mer <subj> Folkestone <obj> twinned administrative body <triplet> Folkestone <subj> Boulogne-sur-Mer <obj> twinned administrative body