I purchased a lot of Mighty Casey when my kids were little. The engines were missing their batteries and chargers, so I made my own battery pack out of "D" cells and used rechargeable batteries. It would run quite a while before the batteries had to be recharged.
For rolling stock we had blue B&M boxcars, yellow passenger cars, and red gondolas. I don't think they made other cars, but I am not certain.
For track we had straights, curves, and a couple of cross tracks.
The track was easily broken. The locking clips would often break off. But the track held together anyway.