Here is a site with some more great pictures.
Thank you very much Gerry for that great link. I love streamline steam and this link is a new one for me.
Thanks again.
Charlie
#6110 is the one I like the most and want to see as a LionMaster...
I second the call for more die cast T1s, both Lionmaster and Scale! 
It is tragic that none of these great locomotives survived.
Check the dates of the negatives on those T1 shots. No. 5511 was built with full Buick streamlining, but modified first in July '46....and a month later into the version we recognize as "modernized". The July '46 type is a unique combination of features never seen until recently, and never modeled, AFAIK.
And the below information is from the Lionel catalog description of 6-28063:
"Lionel’s 5511 model recreates the prototype late in its short life. Sometime after their delivery, Pennsy maintenance forces eliminated the streamlined skirting around the 5511’s cylinders and below the running boards. A supplemental headlight was also added to the front-end, requiring the relocation of the numbered Pennsylvania keystone."
