Allows a Kato 11-105 chassis to be substituted in a Bachmann N scale Brill Trolley when the original mechanism fails.
Can be fitted without glue by clipping to the new chassis and the body shell by the existing mountings.
Not absolutely to scale but a very convincing compromise.
Print upside down so top surface is flat on printer bed (embossed writing upwards) with no supports and the part can be used without any further work.
Part should be 77.4mm long, check print scale.
Chassis 11-105 has the most suitable bogie frames but 11-106 and 11-107 could also be used.