If you have been playing with AX2012 R3 and the transportation module you will have noticed the engines concept that provide the services for rates, transit etc. It looks like there are some changes coming with these as noted in the SCM teams blog.

http://blogs.msdn.com/b/dynamicsaxscm/archive/2014/10/08/third-party-transportation-management-tms-engines-ups-fedex-progistics-pcmiler.aspx

Cheers

Lachlan