Keep in mind that you may be hearing the repeater well enough, but some users are just talking far from the mic or using a bad radio. The SEPTA police channel is known for that. Broken antennas, mics with loose wires in the connectors, cops (and in this case, conductors) that don't have a clue what a radio is (lol). Sometimes you just have to deal with it, especially on railroad channels. God only knows how old and beat up some of their radios are.
One step from "Banned For The Greater Good" lol