Atlas O
Atlas O Master(TM) Horizon Passenger Coach, 3-Rail

Amtrak (Original Scheme)
Walthers Part # 151-6230, p. 128 Walthers 2004 Big Trains Reference
O scale, $109.95, sold out at Walthers

 
Each car features: accurate scale details, painting and printing; separately applied metal handrails; rubber diaphragms on the ends; interior seating; prototypical trucks; operating tail lights; and diecast operating couplers. Minimum recommended track radius is O54.