Of course that is the worst pic! It is a wood sided car and, if memory serves me, had been painted yellow/red with what looked like house paint.
There was a train put together many years ago, which toured Montana. Can't remember what was happening. It was before the State Centennial. I took a picture of a car which was in the Flathead on display years afterward. I'd swear it was painted those same colors. If I could find the pic. It was an ex-B&O passenger car and it is now on display at Alberton, along with a MILW caboose. Just west of the MILW depot. The exterior is covered with cattle brands which were existing at the time of that train. The siding is also similar...