Class 503 trailer composite coach
Introduced by the LMS, as Class AM3 and then designated class 503 by British Railways.. They were designed for, and operated on, the Wirral & Mersey lines from Liverpool to West Kirby, New Brighton, and Rock Ferry.
This is one of the non motored units non driver units.
Requires chassis
Gauge 1 (1/32)
----------------------------------------
more info about class 503 here
https://en.wikipedia.org/wiki/British_Rail_Class_503
more 3d printed models from Recreation21 here
http://www.rue-d-etropal.com/3D-printing/3d_printed_designs.htm
------------------