Since 1 December 2012 Series E259 6-car trains have been operated on a new Marine EXP Odoriko service. The Marine EXP is limited to one return train on weekends. The only difference I see is that the trains carry a Marine Express Odoriko head mark crest.
The Marine EXP is shown pass through Kita-Kamakura, the station with the track level crossing (thanks BB!) and a station between two double tunnels.