No, I don't get it.
I see switch track and made some but I still don't understand how to get the train working. Nevermind the lava for now, all I want to do is get a train from overworld to nether and back. Once I've got that figured out then I can add a liquid loader/unloader and a pump. For now, I can't even figure out all the railcraft tracks. Never used a "switch track" before.
Are you saying we need to run side-by-side tracks to the portal? One track for each direction? But when I place my track side by side, they connect up and do funny things that I don't want them to do. This is why I rarely ever deal with trains.
My idea was to use one tank cart, but I guess that will be slow. Therefore, I guess people use multiple tank carts, and therefore we can't use one-way tracks, we need a track in each direction, both coming and going?
Ten minutes of confusion and I'm already ready to give up on this idea. I can't even place the track properly. LOL sigh
Dimensional Transceivers, here I come! LOL