The National Museum of Transportation in St Louis has a sister locomotive to Daylight 4449. This is Southern Pacific 4460 and is a 4-8-4 Northern type which SP termed a GS-6 and was built in 1943. It was semi-streamlined with a skyline casing which covered the domes on top of the boiler. This feature was designed to lift smoke over the cab and out of the eyes of the engineer. It pulled it's last train for the SP in 1958 and was donated to the museum in 1959.