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ReadingFan posted:

A B&O Docksider was a bit larger and more modern - piston valves and Walschaerts valve gear

 

 

 

Not that much more modern.  The B&O 0-4-0T's were built in 1912, only one year later that the NJZ locomotive.  Slide valves may have been a customer specification or piston valves may not have been an option for such a small locomotive.

Walschaerts valve gear was invented in Belgium in 1844.  The first use of Walschaerts valve gear in the US was on a Mason Bogie in 1874.

Rusty

Rusty Traque posted:
ReadingFan posted:

A B&O Docksider was a bit larger and more modern - piston valves and Walschaerts valve gear

 

 

 

Not that much more modern.  The B&O 0-4-0T's were built in 1912, only one year later that the NJZ locomotive.  Slide valves may have been a customer specification or piston valves may not have been an option for such a small locomotive.

Exactly. The Vulcan 0-4-0T I work on at the New Hope Valley Ry. was built in 1941, and still used slide valves and Stephenson valve gear.

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