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→Rail operations: Spelling, grammar, and general fixes, typos fixed: united states → United States
{{main|Safeworking (railway)}}
{{main|Safeworking (railway)}}
In order to prevent trains from colliding, railroads use electrical signaling systems. The most common systems in use in the united states 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 in the United States are based on variations of [[automatic block signaling]], which can be supplemented by [[positive train control]].
==== Automatic block signaling ====
==== Automatic block signaling ====