This weekend, May 2nd & 3rd, the Santa Fe Northern 3751 will appear hot both days. This is the first appearance at RR days in seven years. BNSF, Amtrak and Disneyland Railway will also have equipment on display. Railroad days is free (donations accepted/encouraged) and hours are 9-5, it is held at Fullerton Amtrak Station, lots of things for kids including a lot of operating model railroads, vendors and food.
The 3751 will arrive Friday afternoon and the departure Sunday afternoon will depend of rail traffic scheduling. While the 3751 will be behind a BNSF diesel, the tradition has been for the 3751 to push the BNSF out of town, at full throttle of course, often the highlight of the weekend.
http://www.scrpa.net/scrrdays.htm