Towards the bottom of the page, it says
CONCEPT
The whole automatic device is designed as a system of several parts of printed circuit boards in a DIN type plastic housing (9 modules) that can be mounted on a DIN rail. The Railduino Module comprises of the following basic parts:
Arduino MEGA 2560 - a printed circuit board with a microcontroller in form of an 8-bite processor ATmega 2560 with the frequency of 16 MHz, known as Arduino MEGA 2560 – an open-source project – more can be found on:
http://arduino.cc/.
Railduino shield is another PCB board enabling connection of all the outside sensors and actuators to the controller, which configures the signals so that the microcontroller can read or control them. In addition, this board ensures all power supply and communication.
Ethernet shield – is an additional (optional) PCB which offers a possibility to connect the whole system to Ethernet network. When this function is engaged then the Railduino Module is additionally equipped with the interface connectors
Looks like a fancy Arduino shield to me.
It does appear like you get Arduino code included for the price, which should interface with the shield, and includes Ethernet drivers.