Railcraft Crash Can't Load world

[MightyNebula]

After trying to build a energy source based on lava with Railcraft between the neather and a mystcraft age ftb crashed and I am unable to login to my world.
Really need help! :/

Minecraft 1.4.6
Ftb launcher v1.2.0
Java 7 update 10 64+32bit
Windows 7 Ultimate 64bit

Crash Report:

 

[Nessiroj]

if i remember correctly (from other posts in the several forums) there is an issue with sending carts through portals atm.
are you connection to a server or on you localpc?

EDIT found on of the posts: http://forum.feed-the-beast.com/threads/crash-after-tankcart-goes-through-mystcraft-portal.7298/

 

[Ashzification]

You can't put carts through portals. It's broken.

Also, get rid of 32 bit Java, you don't need it. And further help can be given when you put your log on pastebin and link it.

 

[Lambert2191]

you can put carts through portals, I've done it myself recently.. the problem is when the destination is unloaded. Then it will cause a crash. Putting a world anchor helps until the server restarts, as world anchors will not work immediately after a restart. Also, chunk loaders, which say that they will load after a restart, don't seem to work.

 

[MightyNebula]

Yes I used World Anchors for the setup and triggered them before setting up the cart. I also tried doing it in a test world where the cart only traveled 5 blocks in the same world and that worked fine so it's probably something with traveling to mystcraft worlds or something.