load test units

what is the purpose of a load test unit?

I am pretty sure a load test unit is used to tesat various locomotive componets before they are placed into another locomotive.
Examples include CSXT WLO2 & NS 1000
http://www.trainweb.org/csxphotos/photo ... CSX-bc.jpg
http://www.nslocos.com/ns1000.html

amoreho1 wrote:what is the purpose of a load test unit?

Utilizing the self load capability or grid stands?

Load testing is utilized to determine if the locomotive engine is delivering rated horsepower.