The Minecart with Mana Pool is not compatible with RailCraft (for things like linking carts together into trains). @CovertJaguar mentioned (here Railcraft/Railcraft#962) that the cart needs to extend EntityMinecart for it to be compatible.

Tested with:
Botania r1.9-334
Railcraft_1.10.2-10.0.0-beta-4
forge 1.10.2-12.18.2.2105

None of that is needed, it all optional. Not even all my carts have that stuff. It should just work. I'm highly skeptical of any reports that it does not.

Looks like it does? https://github.com/Vazkii/Botania/blob/master/src/main/java/vazkii/botania/common/entity/EntityPoolMinecart.java#L42

Yeah.... I'm not really sure (I was looking at the item, not the entity... derp.) Perhaps @Vazkii and @CovertJaguar can figure it out. I'm not well-informed on the Minecraft API, unfortunately.

Well that is not related to vazkii at all. As I see vazkii probably should readd the compat for railcraft from railcraft api, for cart dispensers to place carts properly.

Hmm...it actually appears that something is preventing the Crowbar from interacting with the Cart.

I imagine that if you used a Coupler Track it would work just fine.

Example:
https://www.youtube.com/watch?v=jsnBFOvPbN4&feature=youtu.be
(Sorry for how dark the recording is)

Railcraft/Railcraft#713
#1465
Either of these still relevant?

Confirmed. Coupler track works properly. Maybe there is some kind of "on click" handler that's preventing the crowbar from activating?

event bug?

The mana pool cart does not add any right click interactions, so I don't think this is caused by botania

Does it post minecartinteractevent?

Yeah, the event is a new thing, its not posted in EntityMinecart, but in the child classes. If your minecart doesn't post it, the Crowbar won't work.

@Vazkii this is probably still a bug, even if the cause isn't what I originally believed--something is blocking the RailCraft crowbar from interacting with the mana pool cart.

Oh what, I didn't know carts had their own event instead of using the entity one