Heritage of a SW-1 - NKP #106 by Hoosier Joe Thu Dec 13, 2007 10:15 am My employer is leasing a SW-1 from Independent Locomotive Services. It is ILSX-920,no builder's plate,frame number is 6213-2. Would someone please tell me the unit's history ? Thanks for any answers. Joe Username Hoosier Joe Posts 96 Joined Mon Mar 15, 2004 11:41 pm Location Decatur,In.