As an example, I will use a Mantua reefer. Minimal upgrading had been done to it, retaining its molded-on grab irons and sill steps, but with a reasonable paint and lettering job, as well as weathering. I have been working on some other “mainline” cars also needing new trucks, including some old tank car models and two Athearn metal house cars, but will just describe the Mantua example.
To upgrade the Mantua reefer, there are several options available. One option is to replace
the refrigeration unit with a more efficient model. Another option is to install a new compressor or to replace the existing one. Additionally, the insulation of the refrigeration unit can be improved to reduce energy consumption. Finally, the temperature control system can be upgraded to provide more precise temperature control.


The Mantua reefer is a very basic model, with a simple box body and a single truck. It is a good choice for a beginner, as it is easy to paint and letter, and the parts are readily available. It is also a good choice for a collector, as it is relatively inexpensive and can be found in good condition.

To upgrade the Mantua reefer, there are several options available. One option is to replace
 the refrigeration unit with a more efficient model. Another option is to install a new compressor or to replace the existing one. Additionally, the insulation of the refrigeration unit can be improved to reduce energy consumption. Finally, the temperature control system can be upgraded to provide more precise temperature control.