031019 Ballast regulator at work. With a set of movable blades and sometimes rotating "broom" attachments, ballast regulators shape and distribute the gravel support for railroad track. Also sometimes called ballast plows, these machines not only shape the shoulder of the track support but are also capable of evenly distributing newly applied ballast by moving it from the shoulders to between the rails, or from between the rails to the shoulders. Ballast regulators are used for both newly laid track and for renewal of the ballast on existing track.

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