I'm playing the Long Challenge, the July arena challenge.
I originally played this map with the Windows native version, and decided to go with the Bennhardt B-138 "Apple Pie" locomotive and Canonball BTx 060 2nd Grade Coaches and a Canonball Post Wagon.
When I tried to play the same map with the SDL version, I noticed I couldn't combine this loc with these wagons. When I opened the GDI version I could.
Simutrans Version: 102 (Stable, r2366) GDI & SDL
Pakset: PAK128 (Stable, 1.4.4)