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<p>The simplest explanation is that a freight train's air brake system is slow to respond, and cannot be partially released. You can only make a full release and reapply, which takes time. If the train fits easily in the siding, there's no reason to pull all the way up to the signal.</p> <p>If you're noticing a pattern with consistent distances for each signal, but trains stop close to one signal and further from another, they could be avoiding activation of a nearby railroad crossing. Many are controlled by the train entering a track circuit, the ends of which are marked yellow joint bars, yellow stripes on the rail, or signs reading "CC" or "XC".</p>
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