The vanilla mechanic of placing carts on rails with dispensers doesn't work with Railcraft installed.
The carts are just plopped out as if there was no rail in front of the dispenser.
I tested with all rail-types and all available carts.

Forge used is recommended (2099).

This is intentional though it could be revisited.

I actually didn't know about the RC cart and train dispenser (yes, shame on me), so this point is kind of irrelevant.
Feel free to deal with the issue depending on how you want backwards-compatibility to vanilla mechanics ;D

Mostly it was just because I couldn't be bothered to register a dispenser handler for every one of my carts.

What is usjg?

"Well dispenser should absolutely be removed. Railcraft edits vanilla behaviors, that's all."
wrong. arrows and spawn egges dispence usjg dispensers.

@Joshwoo70 Railcraft also modifies vanilla behavior of minecart with command block and enderman.

and to add on, any mod that removes any vanilla stuff is instantly frowned upon.

Well dispenser should absolutely be removed. Railcraft edits vanilla behaviors, that's all.

I somehow feel you guys are missing the visible and oft complained about change, track recipes.