It takes many years...even decades...to replace all the old CTC signals across a railroad the size of Union Pacific. Indeed, many of the signals along the Glidden Sub in southern Texas have not been replaced. They are still the class SP tri-light signals that were used when the Scarlet and Gray came through here on the Sunset Route.
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With a clear (green) signal now displayed, this eastbound UP manifest prepares to release the brakes and throttle up. It will enter the single track main that will take it east to Rosenberg and, eventually, in to the yard in Houston.
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An eastbound UP manifest sits in the siding at Lissie, looking at a red signal on an "as yet to be replaced" SP tri-light signal. The eastbound is meeting this westbound empty rock train before continuing east toward Houston.
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