Wien / Vienna to Hamburg by train

DB is the national railway operator in Germany, so its website can be used for booking journeys by German express trains; the ICE and IC trains and it doesn't charge booking fees.
It also sells tickets for journeys by direct trains on all international routes from Germany regardless of whether DB is operating the train service.

It also sells an extensive range of end-to-end journeys which involve making connections both within Germany and in neighboring countries, but journeys between Germany and Britain cannot be booked on DB.

On journeys within Germany and on most international journeys from and to Germany on trains operated by DB:

• For journeys by the express trains, EC. IC and ICE trains an adult (on German railways an adult is a person aged 15 and over) can take up to four children aged 6 - 14 with them at no additional charge.
• Tickets need to be booked for children aged 0 - 5, but there is no charge for them.
• Those aged 65 and over can take journeys at a discounted rate.
• Dogs, which are too large to be placed in pet carriers, require tickets which cost 50% of the adult rate.

When booking both types of the discounted 'Sparpreis' tickets seat reservations are an optional extra, so need to be added when booking if you want an assigned seat(s).

OBB is the national rail operator and its booking service offers journeys by express trains within Austria, as well as international journeys which don't involve making a connection outside of Austria.

It pays off to book online, as the discounted 'Sparscheine' tickets are only ever made available on the website, and when making international journeys to and from Austria, these Sparscheine tickets tend to be cheaper.
OBB can offer particularly good value for money when travelling with children on international rail journeys, but something to watch out for when travelling between Austria and Germany on daytime trains, is that reservations are an optional extra; but if you book 1st class tickets with the Germany railways website DB, the reservations are complimentary.

OBB often takes a unique approach to its booking path, but a key thing to keep in mind is that the first price you will see for any journey is that of a Second Class seat.
The costs of upgrading to first class, a reservation, or a sleeping cabin etc, is then added to this price.

Happy Rail is a Netherlands rail ticket agency which sells tickets for both national and international journeys within a range of countries including Belgium France, Germany, Sweden, Switzerland.

HappyRail doesn't charge booking fees in the conventional sense, but if you're not Dutch you can expect to pay additional transaction fees, which will be added to the total cost.
That's because the most common form of online payment used in The Netherlands is 'iDEAL' and HappyRail doesn't charge a transaction fee for 'iDEAL' payments, but only Dutch residents can sign up to 'iDEAL'.
Other forms of payment include Visa debit cards will incur a fee.

Booking places in the sleeping cabins

When entering 2 travellers as 1 male and 1 female, you will automatically be given the option to book a 3-bed cabin for the sole use of the two of you - the 'double' cabin option.
So you will be in the cabin together with no other travellers.

3 men + 2 women or 3 women + 2 men = three beds in a triple cabin + two beds in a double cabin is what you will be offered, though the cabins will then be male and female only.
So if the combination of travellers is 1 male/female couple + 1 male/female couple and a child, you will need to make two separate bookings so that the two couples can each share a cabin.

When 4 Adults are travelling together you will be given the option of booking double or triple cabins.
If you select 'Double' you will automatically be assigned 4 beds in two double cabins.
Because the Triple cabins are segregated into male and female, when two women + two men are in the travel party, the two men will be sharing a triple compartment with another traveller, as will the two women
When 3 men + 1 woman or 3 women + 1 man are the travel party, the fourth person will then be sharing a three bed cabin with two other people.

OBB is the national rail operator and its booking service offers journeys by express trains within Austria, as well as international journeys which don't involve making a connection outside of Austria.

It pays off to book online, as the discounted 'Sparscheine' tickets are only ever made available on the website, and when making international journeys to and from Austria, these Sparscheine tickets tend to be cheaper.
OBB can offer particularly good value for money when travelling with children on international rail journeys, but something to watch out for when travelling between Austria and Germany on daytime trains, is that reservations are an optional extra; but if you book 1st class tickets with the Germany railways website DB, the reservations are complimentary.

OBB often takes a unique approach to its booking path, but a key thing to keep in mind is that the first price you will see for any journey is that of a Second Class seat.
The costs of upgrading to first class, a reservation, or a sleeping cabin etc, is then added to this price.

DB is the national railway operator in Germany, so its website can be used for booking journeys by German express trains; the ICE and IC trains and it doesn't charge booking fees.
It also sells tickets for journeys by direct trains on all international routes from Germany regardless of whether DB is operating the train service.

It also sells an extensive range of end-to-end journeys which involve making connections both within Germany and in neighboring countries, but journeys between Germany and Britain cannot be booked on DB.

A key feature of DB website worth keeping mind is that it offers 1st class ticket purchasers complimentary seat reservations on journeys both within and to/from Germany.

Seat reservations for daytime in both 1st and 2nd class can also be booked separately from tickets.