The German railroad company Deutsche Bahn has recently introduced a new InterCity bus-line from Düsseldorf through Maastricht to Liege. The bus goes back and forth twice a day and only stops in those 3 cities. This is a great alternative to the sometimes difficult public transport to Düsseldorf or Liege. The bus has free on-board WiFi and a free entertainment portal, it has power outlets at the seats and you can even use a BahnCard to travel with discount. Customers have to comfort to use one ticket for their entire journey by IC Bus and by Deutsche Bahn train.
The Bus stops at the other side of the train tracks behind the train station in Maastricht. Just cross the tracks by using the overpass in the station and the IC Bus stop is just to your left as you leave the station. The bus goes to Düsseldorf ZOB bus station and to the bus stop at the Liege-Guillemins train station. According to their schedule, the Bus will go from Maastricht to Liege daily at 12:25pm and 06:25pm and it will arrive approximately 40 minutes later in Liege. If you intend to go from Maastricht to Düsseldorf, you can catch the Bus at 08:20am and 02:50pm and you will be traveling for about one and a half hours.
Prices start from 9€ from Maastricht to Düsseldorf and from 7€ from Maastricht to Liege. In order to book a ticket and reserve a seat, as well as finding exact times and prices download this flyer and visit their website.