Can find the specs of the 11 different T Series Sony Notebooks here:

http://www.sonystyle.com/is-bin/INTERSHOP.enfinity/eCS/Store/en/-/USD/SY_BrowseCatalog-Start?CategoryName=cpu_VAIONotebookComputers&CP=sony_hm_nav_elec_nbkshop

Can't find a list of the TR Series. If you have the Model Number of the TR notebook you are considering, type it in Google for a search and then compare specs with the T Series. Google also indicates some users comments on the TR Series Notebook....but what Model #'s...to compare T with TR's.