Doris (3.5 Gauge)

Overview
Doris is a 4-6-0 Tender locomotive designed by LBSC following the general design of the LMS Class 5. It was described in Model Engineer Volumes 98-101. It uses a taper boiler design which makes it slightly more difficult to construct than parallel boiler designs.
 * Length: 48.25"
 * Boiler Dia: Taper
 * Cylinder Bore: 1.156"
 * Driving Wheel dia: 4.5"

Drawing Errors

 * With regards to the regulator, the distance between the upper and lower pivot points on the regulator body is 21/32" and the length of the lower arm is 19/32". This prevents the arm from being able to travel it's full arc since the lower boss interferes with the arm. The length of the lower arm needs to be reduced or the distance between the pivot points increased.