For those who would like one of these and not wait for Bachmann to manufacture one - Deerfield River Laser makes a nice kit. I have assembled several of their kits and they are excellent. The link below will take you directly to the web page for the kit.
http://www.deerfieldriverlaser.com/DRL-O-104.html (ftp://http://www.deerfieldriverlaser.com/DRL-O-104.html)