Southern Pacific also evaluated the MoPac design, then in 1980 they came up with their own variation with a shorter roof. Just one car was built, becoming Southern Pacific’s famous caboose #1 or “the One-Spot.” It entered system-wide service at a time when SP was experimenting with an orange, red and gray paint scheme. It would wear this scheme for its entire service life. In the years after regular operation with cabooses had ended, the One-Spot found a home at the end of Southern Pacific’s fire suppression train. This car will be equipped with coil spring roller bearing trucks.