A rear view of a modified Kalmar Ottawa yard tractor shows off electric-drive components made by Escondido-based TransPower.

A rear view of a modified Kalmar Ottawa yard tractor shows off electric-drive components made by Escondido-based TransPower.

— Escondido-based TransPower, a maker of electric-drive systems for big-rig trucks and industrial-site tractors, is on a growth path...

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