Definitely a magnetic crane. I have a prewar #165 that works very well, but I think the gantry crane may be easier to use.
I'm not so sure about coal loading accessories. In my experience with my #97 they tend to be very messy and the loaded cars are a pain to clean up in the event of a wreck. For a similar unloading - loading action, I would recommend a lumber loader (#164 might be a bit too big for your table, but a #364 might work).
Regards,