Does anyone know where I can find a walthers trainline dash-8 bhw amtrak in ho scale
http://www.railpictures.net/viewphoto.php?id=89835&nseq=4
I'll make your link clickable: http://www.railpictures.net/viewphoto.php?id=89835&nseq=4
Some hobby shops may still have one or two on a shelf somewhere, hard to say. Ebay would be your better chance of finding one. As a matter of fact, there are two being sold as I type this, different paint scheme than the picture you posted, here is one of them: click_here. The price being asked for the engine is too much, so I'd pass on it, but every now and again someone will list one of these engines at a more reasonable price.
Another option is to buy an undecorated dash 8-40bw and modify the fuel tank and whatever other details to make it a believable Amtrak engine. If you're really lucky, you can find an undecorated 8-40bwh. Many undecorated versions are offered pretty cheap and microscale does have the decals available: Dash_8-32BWH_decals
Good luck.
TONY
"If we never take the time, how can we ever have the time." - Merovingian (Matrix Reloaded)
Atlas made some of these also.
http://www.atlasrr.com/HOLoco/hodash840bw.htm
http://www.atlasrr.com/HOLoco/hodash8locos.htm
http://www.atlasrr.com/HOLoco/hodash8series.htm
Scroll to the bottom to see what roadnames there are, the third link only has Amtrak California.