I found this historic 1960's era black and white photo from the Belt Railway of Chicago at My Link Page Fallen Flags.Org, located to the right of Your computer screen at www.rr-fallenflags.org

Photographer J.R Quin, snapped this photo of Belt Railway of Chicago Alco (American Locomotive Company) model S 6 yard switcher # 420, at the west end of the BRC Clearing Yard locomotive shops, in southwest suburban Bedford Park Illinois during
the year of 1964.

Although the American Locomotive Company had went out of business in 1969, locomotive # 420 shown here, actually stayed on the BRC roster until 1999, when
this locomotive and the remaining mid 1960's era BRC Alco Century Series heavy
roadswitcher locomotives were finally retired.