While the previous answers justify the reason for it not being there, you can find it. At least for ÖBB trains, head over to the *Fahrplan* (i.e. the Timetable). These can typically be found around the stations or on the platforms. You will find that every train, even the S-Bahn, has a unique *Zug-Nummer* (Train Number).

![](http://blog.belcl.at/data/Windows-Live-Writer/d3f9f594500f/6065EB4B/2012_05_23_Fahrplan.jpg)

<sup>[Source](http://blog.belcl.at/2012/05/24/blumau-gaumenfreuden-radtour-mit-oebb/) (Ignore the yellow circle. It just indicates the train does not operate on a certain day)</sup>