hi I host a minecraftmania-server too with the version:
Minecart Mania 2.4 Beta has been initialized successfully
hmod 133
server: 1.1_02
it went the following;
I setup a testsite with the station-brick and a sign where the cart moves to a direction if its empty and to another if a player is in it
as it was empty it worked, as player the server crashed the exactly same way as in the closed bug
https://sourceforge.net/tracker/index.php?func=detail&aid=3146357&group_id=380965&atid=1584859
player deletion wont work, if you get in the area, all crash.
But you can repair it:
1) copy the world to you local machine, download and install the app: MCEdit
2) open the world with it,
3) go to the bug-place you will see that that is in a purble color.
4) I deleted a 4 blocks area to make sure that the intersecion is gole.
5) reupload the world to the server
6) DONT use intersections any more, till its fixed.
cheers devzero