Well I have lot of MPC stuff as I only re-entered into the Lionel era after my sons were born in the early 70's. So most of my new train buying was MPC. In collecting I tend to go for the pre-war struff but I mostly run MPC...reliable, easy to fix, maintain. Here is one I got just this Saturday at a train show in Plano, Tx.
Lionel MPC #8551 Santa Fe Alco from 1973-75 This engine was only sold as a stand alone "A" unit.
Here is a little video with a short train, note IC boxcar is MPC as well.
Best Wishes
Don