CPLT meaning in Regional ?

Answer: What is Camino, Placerville and Lake Tahoe Railroad mean?

The Camino, Placerville and Lake Tahoe Railroad (reporting mark CPLT) was an 8-mile (13 km) Class III short-line railroad operating in the Sierra Nevada in California, east of Sacramento. It was built primarily to haul lumber from the El Dorado National Forest. The standard gauge line ran west 8.05 miles (12.96 km) from a sawmill at Camino to a connection with the Placerville Branch of the Southern Pacific Company at Placerville. Loaded cars of lumber descended a 3.5 percent grade from 3,150 feet (960 m) at Camino to 1,900 feet (580 m) at Placerville.

reference

Full Form	Category
Chemistry and Physics at Low Temperatures	Academic & Science
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Camino, Placerville and Lake Tahoe Railroad	Regional