Finally found 4561 Railway Express for an ok price at the thrift store. It even included 10014 Caboose as a bonus. So far it's looks mostly all there. : r/LEGOtrains
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LEGO Transport Depot Railroad 4561 - Etsy
MOC] Virtual - 4561 upgrade to locomotive and Club Car - LEGO Train Tech - Eurobricks Forums
4561 Railway Express from 1999 : r/lego
LEGO 9V Train 4561 Railway Express from 1999 - YouTube
LEGO 4561 Railway Express with Transformer and Speed Regulator Set Parts Inventory and Instructions - LEGO Reference Guide
Railway Express with Transformer and Speed Regulator : Set 4561-1 | BrickLink
Amazon.com: VERY RARE: Lego Railway Express Train Set w/ Transformer : Toys & Games