How to travel from Berlin to Krakow during the day by EC 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).

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.

Omio is an online ticket agency which offers tickets for rail journeys in France, Germany, Great Britain, Italy and Spain.

The three key advantages of using Omio are

• it offers prices in multiple currencies
• it usually offers price comparison with other modes of travel including flights and buses
• when visiting Europe, you can book journeys in multiple countries in one transaction.

The disadvantage of booking with Omio is that it often adds a booking fee to the final price; therefore when it does so without offering a price advantage, SMTJ doesn't tend to offer Omio as a booking option.