Peggy A, JoAnne, here is something I will give Trainline. It’s sort of like Google Flights in some regards, that is you can see most of the train companies making a route. Generally that is two, departure country company and arrival country company. Occasionally there are private companies as well and those will show up.
I just checked Budapest to Vienna for tomorrow. The Trainline did show all the trains that also appear on the OBB and MAV websites, and it showed and recommended the private RegioJet train without pointing out that it left from a remote station. The other trains were identified as OBB or RailJet. RailJet is OBB, but I don’t think all of the trains identified as OBB were actually OBB, I think a few are MAV. Some are EuroCity trains with Hungarian names at least. On this route it doesn’t matter neither is faster than the other.
I think the company name being shown is whose ticket you will end up with and that makes sense as ...
if you buy from The Trainline the 33€ ticket on MAV website will cost you 52.90€
... which is also what OBB sells the ticket for. Now some may think the ease of using the app makes the extra 19.90€ a good investment. For me not such a great deal.
So I will amend my opinion to say, sure, go to The Trainline to see if there are any private carriers on the route. THEN, go the Private Carrier website and the website of the departure and the arrival country and buy from one of the three …. You can always check back against The Trainline to see if they are cheaper, and as described above that could happen, but I don’t belive it will be the norm.
EDIT: Annother reason to not have a lot of trust outside of the national train companies.
I just checked Budapest to Eger. The Trainline said no tickets available for the 4 dates I checked. Not true. Then I checked Budapest to Gyor. The charge was 5.90 euro and all they list are the RegioJet (private company) ticket. No MAV or OBB trains were shown (both stop in Gyor on the way to Vienna).
The price was about the same as a MAV train on the route (but from a remote station on Budapest).
But the kicker here is that when setting up the The Trainline search you can choose Youth (0 - 25) Adult (26 - 59) or Senior (60+). Well, 65+ in Hungary travel the local trains for free and The Trainline was going to charge me and put me on a private train.
In accurate information and higher prices. Why bother? Ohhh, but not always ... but how do you know unless you do all the research at the other websites and if you are going to do that, just buy the tickets from the people running the trains.