Breaking my long silence to share happiness (if a little bit frustrating) about the fully booked Warsaw-Mockava(-Vilnius) connection. 36 bicycles inside, mostly to Polish tourist destinations (Augustów, Suwałki to some extent), but at least 4 continuing into Lithuania.
I must admit I was wrong in being too pessimistic about this train connection. There is a lot to improve, but finding tickets is already a little bit difficult due to it being sold out. I thought it's going to carry air.