The V43 1231 at Budafok-Albertfalva station

On the "official" route 30a, there’s only one track, so to provide chance for trains to cross, there are two stations with a siding, Budafok-Albertfalva and Érd alsó on the Budapest section of the line. Practically fast trains go on the paralell double-track 40a route. This situation is because in the past the Pusztaszabolcs line was MÁV, while the Székesfehérvár was Southern Railways, and they didn’t want to share tracks.