Dual Tracking

What rules apply with light rail and regular rail working close with each other?
I saw a light rail going one way and a freight train going in the opposite direction on the same dual track. So now I’m confused. This applies to the US.
All trains are governed by the rules in place on the railroad upon which they are running at the time.
It’s a safe bet your ‘regular’ train is running according to the rules set forth in the General Code, or GCOR. So, when light rail, or other foreign lines, such as in the case of a detour, for that matter, will be running according to these rules.
When foreign lines are running on another’s tracks, the rules regarding train make-up restrictions or speed restrictions on equipment, etc., the regulations of the home road apply.
Any engineer, including some of those of light rail transit, require FRA certification to operate. If a light rail motorman isn’t qualified, he will have a ‘pilot’ assigned to him. In this case, a ‘pilot’ is an employee assigned to assist some one either unfamiliar with the territory or not qualified for the district.
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