Can you name this UP LOCO??

I saw this pic,, and noticed the old "UP" Symbol on the side anybody know what it is, and roadnumber? It is currently Numbered X18

http://www.railroadmichigan.com/lsi2407.jpg

After a bit of reasearch I came up with this....

It is at the Illinois railway Museum... and get this... It is one of the old UP TURBINES!!!! YES!

Read the info for yourself!!!!

http://www.irm.org/cgi-bin/rsearch.cgi? ... ailroad=18