I found this old picture from the 1943 Porter Locomotive Company catalog at My Link page Fallen Flags.Org, located to the right of Your computer screen at http://www.rr-fallenflags.org/

Seen here, is a 76 Ton coal burning 0-6-0 steam locomotive, that was suitable for working as an in plant switcher at a manufacturing plant. Locomotives like this would often wind up working on short line railroads during the steam era.