Helsingor.
We had a one week holiday to Denmark in August/September this year and stayed in Helsingor and used the trains a lot and one round trip on the ferry to Helsingborg
www.forsea.com.
The ferry service runs 24 hours. The base service Mon-Sat from around 06.00-22.00 is a ferry every 20 minutes - at busy times (certain peak times or summer months) the service is every 15 minutes. The travel time is 20 minutes with 10 minute turnround so each ferry does one round trip every 60 minutes and it runs to time.
The service is normally run by 3 ferries (M/F Tycho Brahe (1991), M/F Aurora (1991) and M/F Hamlet (1997) all of the same design (but not identical) with a 4th older ferry (Mercandia IV) (to provide the 15minute frequency) and a 5h older ferry (Mercandia V) as a backup.
M/F Tycho Brahe and M/F Aurora were built to take cars, lorries, coaches and trains - so they are double ended (and can go either way) roll on roll off ferries with rails built into the car deck - 3 lines for 9 carriages.
But The Bridge put an end to the train ferry. On our visit there was no sign of rails on the vehicle deck (plated over or deck plating replaced), or in the quayside ramp or the approach from the station to the quayside ramp. The relevant ferry docks and ramps have not moved and remain in use.
You can see the stub remains of the line/siding that went from the side of the station to the ferries, on the right of this picture -
https://www.flickr.com/photos/peter.../www.flickr.com/photos/peter2222/34738053855/
The above picture is taken from a passenger footbridge linking all the platforms at the platform mid-point. The ferry terminal building is the yellow building right of centre and there is a covered high level fully glazed walkway all undercover direct to the 2 ferry berths hiding at the right of the picture. The ferry berths are about 100m beyond the front of the station so the raised walkway is 200m-400m.
As has already been said earlier, there are now electric ferries on this route. M/F Tycho Brahe and M/F Aurora were built with 4 diesel engines. About 2-3 years ago, 2 diesel engines were removed and 4mw of batteries installed. So the ferries cross quietly and at each port an arm clamps onto the ferries side to provide the fast charge/recharge - 10 minutes charge for a 20 minutes crossing. M/F Hamlet has not been converted. There is a low point around 3am when the frequency drops to one an hour - perhaps an electric recharge catch-up opportunity?
To the left of the picture is the bus station and then the shops so the station is in a good central location between the shops and The Sound.
The train service from Helsingor -> Copenhagen -> Copenhagen Airport is 24 hour and operated by the Oresundstag units (over 100 of them). The Monday to Saturday base service from about 06.00 to 21.00 is every 20 minutes so thus both the trains and ferries can be classed as a turn up and go service. Trains continue to and from various Swedish locations with up to a 3 hour journey time in Sweden plus 1 hour from Helsingor to The Bridge - except late evening to early morning and no through service on Sundays (connections at Copenhagen/Airport)