Two westbounds sit side-by-side at Tolland, both waiting to see who gets to continue west first. At a glance, how can you easily tell which train is on the main and which is on the siding? If you look at the track to the left, note that there are regular joints in the rail periodically. Not the case for the track to the right. That indicates the track to the left, having "jointed" rail, is the siding. The mainline has welded rail.
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