Triple

Given a phrase, classify it is english named entity (e.g., persons, organizations, works of art) in Latin script, or not (e.g., literals, dates, URLs, verbose phrases). For disambiguation, the statement where the phrase occurs as object is also given. Please return a JSON object with `phrase` (string, the phrase being analyzed) and `is_ne` (boolean, indicating whether the phrase is a Named Entity).

Phrase: Stephenson valve gear is usually located between locomotive frames | Statement: [Walschaerts valve gear, distinctionFrom, Stephenson valve gear is usually located between locomotive frames]

Target entity: Stephenson valve gear is usually located between locomotive frames
Context triple: [Walschaerts valve gear, distinctionFrom, Stephenson valve gear is usually located between locomotive frames]

• A. Climax geared steam locomotive on the Durbin Rocket
  The Climax geared steam locomotive on the Durbin Rocket is a historic, gear-driven logging engine preserved in tourist service on West Virginia’s Durbin & Greenbrier Valley Railroad.
• B. Cab-forward steam locomotives
  Cab-forward steam locomotives were a distinctive type of steam engine with the crew cab placed at the front of the locomotive to improve visibility and reduce smoke exposure, most famously used by the Southern Pacific Railroad in mountainous terrain.
• C. Forney locomotive
  The Forney locomotive is a compact 19th-century steam tank locomotive type, notable for its rigid wheelbase and rear-mounted fuel and water tanks, widely used on urban elevated and commuter railways.
• D. steam engine house (Maschinenhaus)
  The steam engine house (Maschinenhaus) in Babelsberg Park is a historic 19th-century pumping station built in a romantic, castle-like style to supply water to the park’s fountains and landscape features.
• E. Lion steam locomotive
  The Lion steam locomotive is a preserved early 19th-century British steam engine famed for its role in the Liverpool and Manchester Railway and as one of the oldest surviving working locomotives.
• F. None of above. chosen
• G. Unsure - the case is ambiguous/there is not enough information to decide.

Generate a one-sentence description of the target entity. 
You are given a context triple in the form (subject, predicate, object), where the object is the target entity. 
# Instructions
Use the triple to infer relevant information about the entity. Describe the entity based on what is most defining, well-known. 
Avoid repeating the information from the triple, unless really essential.
# Response Format
Return only the sentence: "Description: [one-sentence description of the target entity]"

Entity: Stephenson valve gear is usually located between locomotive frames
Triple: [Walschaerts valve gear, distinctionFrom, Stephenson valve gear is usually located between locomotive frames]

Stephenson valve gear is an early and widely used type of steam locomotive valve gear mounted between the frames, employing eccentrics on the driving axle to control steam distribution to the cylinders.

Target entity: Stephenson valve gear is usually located between locomotive frames
Target entity description: Stephenson valve gear is an early and widely used type of steam locomotive valve gear mounted between the frames, employing eccentrics on the driving axle to control steam distribution to the cylinders.

• A. Climax geared steam locomotive on the Durbin Rocket
  The Climax geared steam locomotive on the Durbin Rocket is a historic, gear-driven logging engine preserved in tourist service on West Virginia’s Durbin & Greenbrier Valley Railroad.
• B. Cab-forward steam locomotives
  Cab-forward steam locomotives were a distinctive type of steam engine with the crew cab placed at the front of the locomotive to improve visibility and reduce smoke exposure, most famously used by the Southern Pacific Railroad in mountainous terrain.
• C. Forney locomotive
  The Forney locomotive is a compact 19th-century steam tank locomotive type, notable for its rigid wheelbase and rear-mounted fuel and water tanks, widely used on urban elevated and commuter railways.
• D. steam engine house (Maschinenhaus)
  The steam engine house (Maschinenhaus) in Babelsberg Park is a historic 19th-century pumping station built in a romantic, castle-like style to supply water to the park’s fountains and landscape features.
• E. Lion steam locomotive
  The Lion steam locomotive is a preserved early 19th-century British steam engine famed for its role in the Liverpool and Manchester Railway and as one of the oldest surviving working locomotives.
• F. None of above. chosen