I have latest STL library installed. 
Your steam_s1_1921.gse script includes this line: 
include "msmotorvehicle.gs" 
STL library includes only msmotorvehicle.gse 
Since You can't help me to test it by making modification which takes 5secs, 
I solved it by deleting Your loco. 
Thank You for support anyway.
		 
		
		
		
		
		
		
		
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