Load Testing
After having work done in the shop, Union Pacific GP20 No. 489 is undergoing tests via a 'Load Box' in Salt Lake City, Utah on Jan. 28. 1978. This device is designed put an electrical load on the engine in an attempt to 'break it down' and discover defects prior to placing the locomotive back in service. From EMD's production SD40-2 to the present, locomotives have been equipped with a self-load feature, eliminating the need for an external test. Thank you to Warren Johnson for the information.
Load Testing
After having work done in the shop, Union Pacific GP20 No. 489 is undergoing tests via a 'Load Box' in Salt Lake City, Utah on Jan. 28. 1978. This device is designed put an electrical load on the engine in an attempt to 'break it down' and discover defects prior to placing the locomotive back in service. From EMD's production SD40-2 to the present, locomotives have been equipped with a self-load feature, eliminating the need for an external test. Thank you to Warren Johnson for the information.