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=== Rail operations ===
=== Rail operations ===
{{main|Safeworking (railway)}}.
{{main|Safeworking (railway)}}
In order to prevent trains from colliding, railroads use electrical signaling systems. The most common systems in use today are based on variations of [[automatic block signaling]], which can be supplemented by [[positive train control]].
In order to prevent trains from colliding, railroads use electrical signaling systems. The most common systems in use today are based on variations of [[automatic block signaling]], which can be supplemented by [[positive train control]].