Just got back and attempting to catch up with everything I missed!
I just wanted to a post a heads up here and apologize for the issues with the Tracking Aura blocks with isAirBlock() checks that are missing in Forge and various mods.
Anyone having weird issues with Railcraft installed should try disabling the Tracking Block by setting the config option “block.hidden” to “0”.
Hopefully the Forge team will track down and fix all the remaining issues in vanilla fairly quickly. 😉