BNSF #9939 (EMD SD70MAC)

BNSF #9939 (EMD SD70MAC)
electric trains
Image by cliff1066™
The EMD SD70 was a series of diesel-electric locomotives produced by the Electro-Motive Diesel beginning in 1992. Over 4,000 locomotives in this series were produced, mostly of the SD70M and SD70MAC models. All locomotives of this series are hood units with C-C trucks. All SD70 models up to the SD70ACe and SD70M-2 have the HTCR Radial truck, rather than the HT-C truck; the self-steering radial truck was designed to allow the axles to steer in curves, reducing wear on the wheels and railhead. With the introduction of the SD70ACe and SD70M-2, in an effort to reduce cost EMD introduced a new bolsterless non-radial HTSC truck as the standard truck for these models. The radial truck, now the HTCR-4, is still an option. (Wikipedia)

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