Question: When was the Southern Railway 107 sold to help with the construction of a hydroelectric dam on the French Broad River in Sevier County, Tennessee?

Context paragraphs:
Boyds Creek, Tennessee: Boyds Creek is an unincorporated community in Sevier County, Tennessee, United States.  It is named for a small southward-flowing tributary of the French Broad River of the same name, which itself derives its name from a Virginian trader, killed by a band of Cherokee Indians, whose body was thrown into the stream.  The creek was the site of a 1780 battle (The Battle of Boyd's Creek) between white settlers and Cherokee angry at the settlers' encroachment onto their hunting territory.

Richard &quot;Preacher Dick&quot; Evans: Richard E. Evans (Jan. 4, 1824 - Dec. 6, 1901), also known as "Preacher Dick," or "Uncle Dickey," was a Baptist preacher who served in East Tennessee and western North Carolina.  Evans was born in Sevier County, Tennessee, the only son of Jacob Evans of South Carolina and Martha Ogle of Tennessee.  He died in Sevier County and his remains are interred in Sevier County's Forks of the River Cemetery.

French Broad River: The French Broad River flows 218 mi from near the town of Rosman in Transylvania County, North Carolina, into the state of Tennessee.  Its confluence with the Holston River at Knoxville is the beginning of the Tennessee River.  The river flows through the counties of Transylvania, Buncombe, Henderson, and Madison in North Carolina, and Cocke, Jefferson, Sevier, and Knox in Tennessee, and drains large portions of the Pisgah National Forest and the Cherokee National Forest.

Sevier, Utah: Sevier is an unincorporated community in southwestern Sevier County, Utah, United States.  It lies in the valley of the Sevier River along U.S. Route 89 southwest of the city of Richfield, the county seat of Sevier County.  Its elevation is 5,584 feet (1,702 m).  Although Sevier is unincorporated, it has a post office, with the ZIP code of 84766.  It has a population of about 80 people.  Sevier has many farms.

Marysvale Canyon: Marysvale Canyon (sometimes referred to as Sevier Canyon) is a canyon in Piute and Sevier counties in southwest Utah, United States which runs 8 mi north from just north of Marysvale north to the town of Sevier.  It is a steep walled canyon formed by the flow of the meandering Sevier River.  The narrow canyon lies between Sargent Mountain on the northeast corner of the Tushar Mountains to the west and the margin of the small Antelope Range of Sevier County to the east.  The canyon ends to the north at the intersection of the Sevier River with Clear Creek Canyon which forms the north margin of the Tushars.  To the south the canyon starts about 2 mi north of Marysvale where the broad Sevier Valley narrows abruptly from a broad 5 - wide valley to a narrow gorge.

Sevier County Fairgrounds: Sevier County Fairgrounds is a fairground in Sevier County, Tennessee, and is the host of many events throughout the year.  It is a multi-use facility consisting of 17 acres located along the Little Pigeon River.  The fairgrounds currently hosts the annual "Circle Yer Wagons" VW Car Show, tractor pulls, Auctions, Master Gardeners Garden Show, Fundraiser Events and is home to the Sevier County Fair each year during Labor Day week.

Southern Railway 107: Southern Railway 107 is a steam locomotive built in November 1887 by Baldwin Locomotive Works for Southern Railway.  It is a 2-8-0 consolidation of Southern's G class.  It first worked on the East Tennessee, Virginia & Georgia Railroad as their #419.  In 1894, the ETV&G and the Richmond and Danville Railroad merged to create the Southern Railway and #419 was renumbered to 107.  The locomotive continued service on the Southern until it was sold to the Smoky Mountain Railroad in 1942 to help with the construction of the Douglas Dam.  On December 9th, 1954, the SMRR brought in a GE 44 ton diesel to replace the steam locomotives and #107 along with the other SMRR steamers were left on a siding to rust.  In 1961, #107 was placed on display in Sevierville along with 2-6-0 #206 (Baldwin, 1910) to advertise the Rebel Railroad (later Dollywood).

Wilbur Dam: Wilbur Dam is a hydroelectric dam on the Watauga River in Carter County, in the U.S. state of Tennessee.  It is one of two dams on the river owned and operated by the Tennessee Valley Authority.  The dam impounds Wilbur Lake, which extends for about 3 mi up the Watauga to the base of Watauga Dam.  Completed by 1912 the Ocoee Dam No. 1 is the only Hydroelectric dam that is older, Wilbur Dam was one of the first major hydroelectric projects in Tennessee, and remains one of the oldest dams in the TVA system.

Douglas Dam: Douglas Dam is a hydroelectric dam on the French Broad River in Sevier County, Tennessee, in the southeastern United States.  The dam is operated by the Tennessee Valley Authority (TVA), which built the dam in record time in the early 1940s to meet emergency energy demands at the height of World War II.  Douglas Dam is a straight reinforced concrete gravity-type dam 1705 feet (520 m) long and 202 feet (62 m) high, impounding the 28420 acre Douglas Lake.  The dam was named for Douglas Bluff, a cliff overlooking the dam site prior to construction.

Fort Patrick Henry Dam: Fort Patrick Henry Dam is a hydroelectric dam on the South Fork Holston River within the city of Kingsport, in Sullivan County in the U.S. state of Tennessee.  It is the lowermost of three dams on the South Fork Holston owned and operated by the Tennessee Valley Authority, which built the dam in the early 1950s to take advantage of the hydroelectric potential created by the regulation of river flow with the completion of Watauga Dam, South Holston Dam, and Boone Dam (which were primarily flood control structures) further upstream in preceding years.  The dam impounds the 872 acre Fort Patrick Henry Lake.  While originally built for hydroelectric generation, the dam now plays an important role in the regulation of water flow and water temperature for the John Sevier Fossil Plant and other industrial plants downstream.

Supporting paragraphs: Southern Railway 107 Douglas Dam
Answer: 1942