I recently received my 20618-1 which has the "Streamliners At Specer" sound file. I do not have the MTH DCS system and I run conventional. A fellow forum member who has 20-20618-1 replied to a previous post saying this.
Yes, The 20-20618-1 (cab#1011) has the regular ol' Passenger Announcements-- Train #1, the "Wabash Canonball", with stations stops at Logansport, Lafayette, Decatur, and St. Louis.
The 20-20617-1 (cab#1009) is a special, excursion Passenger Soundset ("Streamliners at Spencer"), as do the Erie and the Southern models, detailing the history of each engine.
With that being said I am hoping someone from the WNY area could help me out.
Thanks, Chas 
