You're right. According to the FRA, it's 4.1 billion over ten years (1998 dollars):
The FRA's idea is to upgrade existing right of way with better signalling, etc. and not buy additional right of way (although they may do that in some areas). Travel times still favor the airplanes for trips over 300 miles. And the published four hour, 111 mile trip from Indianapolis to Louisville is downright pathetic. I hope it's a misprint.