# 2.9.1.2 Car Part Dialog

This dialog is similar the the Car Item dialog except that the Car Item Information section is not displayed. The Manufacturer Drop Down List is editable so you can enter a new manufacturer, and you must enter a Part Number. If you are adding a new car part, the Part Number field will be incremented (if it is a numeric value) so you can enter a number of car parts.

The middle section contains:

  The Road, Reporting Mark, Number and Color. You can choose a Road name from the list of known road names or enter a new value. If known, the reporting mark (road name abbreviation) is filled in.

  Car Dimensions which contain the major dimensions of the car and how the coupler is mounted on the car. The Coupler Length is measured from the edge of the car body to the pulling face of the coupler. It is equivalent to half the separation between two coupled cars.

  - When entering values, the `p` key will convert a prototype measurement to a scale measurement.

  - The length dimension has the following relationship, so changing one value will affect the others:

      Coupled Length = Car Length + 2 * Coupler Length

  A diagram showing the position of the trucks and couplers.