I finally found out were the 16-cylinder diesel engines out of the Ex Amtrak F40PH locomotives ended up in. Looks like the are being installed into the M62/ST44 an old Russian made diesel locomotive.
“Rail Polska have introduced even more comprehensive modernization project. In 2006, three M62s (M62-1117, M62-1121 and M62-1108) from Estonian EVR railways were fitted with GM 645E3B 16-cylinder two-stroke diesel engines, rated at 3000 hp. These diesels were taken from withdrawn class F40PH locomotives (Montreal, Maine & Atlantic RR).”