I tried the fast Ro-Ro station posted 2-3 posts above me without Cargodest.
I only use what the original game offers me so... I had to use the pre-signals etc to simulate the thing.
I just took a previous game, made the big station, signals etc, then funded a power station and lotf of coal mines for one loading station. Basically the trains are doing a small circle now.
I got 30 trains going smoothly in this one. 2 lines, about 8-9 unload slots used max, the train can leave the station after unloading to wait until it can join the mainline again. I hope I got the signals right...
Basically the first four stations are meant for the inner track, then the next lines are for the outter track and also, the trains from the inner track could go over to the outter track stations. 30 trains moving without problems. Adding another track can only increase the station capacity... 4-5 stations per line is about enough. At least with my settings.
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Everything I circled in purple should be combo pre-signals, not entry. And personally, I would use only regular signals after the station. With back to back entry pre-signals in the picture, that is pretty much how it is behaving.
The first signal after those platforms should be a regular signal to free up the platform quicker. The next signal (the one at the end of the waiting space) could be an entry (like they are), then all the signals in those diamond looking track blocks could be combo's, and the las signal after those be exits (one for each line, so two total, like you have). The problem I see is that a maximum of two trains can leave the station at the same time (one per mainline track). It might work OK with the station entrance like it is.
That arrangement can also lead to one train blocking the whole entrance or exit. If the train in the far lower right chooses the platform closest to the power station, then it blocks the other track entering the station. Same thing for the exit with the far platform.