DD1 may refer to:
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DD National
DD National (formerly DD1) is a state-owned public entertainment television channel in India. It is the flagship channel of Doordarshan, India's public service broadcaster, and the oldest and most widely available terrestrial television chann ...
, an Indian national channel
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PRR DD1
The Pennsylvania Railroad DD1 was a class of boxcab electric locomotives built by the Pennsylvania Railroad. The locomotives were developed as part of the railroad's New York Tunnel Extension, which built the original Pennsylvania Station in New ...
, Pennsylvania Railroad's class of electric locomotives
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