@Tes yeux noirs,
This "problem" seems easy, a priori. Say, for example, 5 convicted killers had a simultaneous date with old sparky, and you could, at the last minute, send the current to some guy eagerly watchin in the front row. Who ya gunna call?
Just ask yourself: How come 5 people are tied to the track. Obvious, aint it? Because they DESERVED it.
If, for some damn reason, they tied themselves to the tracks, say, for example, because they were tryin to stop the shipment of whale meat, or some ****, then give em what they want. Don't mess up some poor innocent bystander, ya know?