Page "GWR 2800 Class" Paragraph 2
from
Wikipedia
No. 97 undertook two years of trials before going into production.
Initial results suggested that only the front end needed further development.
Initially the boiler pressure of the 2-8-0 was set at with diameter cylinders.
Tractive effort started out at but was increased substantially in the production engines by enlarging the cylinder diameter to and raising the steam pressure to.
The piston valves were enlarged to.
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2.075 seconds.