I have looked at the 4-8-2 SLSF 1522 many times and thought the disc type main driver on the # 2 axle looked out of place next to the spoked drivers on axles # 1, # 3 and # 4. Then I just saw an old picture on this site with them all spoked. Does anyone know when this switch out took place and possibly why? Thanks, Jerome
The Scullin disc-centers, provided a strong, well-balanced design for the modern locomotive. Please see the following link. http://www.frisco.org/vb/showthread.php?6518-Scullin-Driver-Patent-Jan-25-1936&p=49055#post49055 Edit 4/8/2024: Trying to repair the broken link above. As an alternative, please see the following link. https://www.steamlocomotive.com/types/drivers/ Added an alternative link discussing Scullin disc driver centers. MKD
Thanks. After looking around here and seeing Karl's nice posting on the Scullin disc driver centers I guess it was not all that uncommon of an upgrade. I also wanted to ask if there was a source for drawings of the 4-8-2 SLSF 1522 or other late 1500 series that had Walschearts valve gear? I am contemplating building a large scale locomotive and trying to assess if the SLSF 1522 would be a good choice. I figured living in St. Louis and being able to visit the prototype would be beneficial. Also having had the thrill to take an excursion on it sure makes it a sentimental choice as well. Thanks, Jerome