Talk:LB&SCR I3 class

Driving wheels
Although the prototype I3 locomotive (BR №32021) had 6'9" driving wheels, the remainder of the class was constructed with 6’7½” drivers. ˜˜˜˜ —Preceding unsigned comment added by Crudshoveller (talk • contribs) 14:49, 26 October 2009 (UTC)

Other classes
There were also classes I1, I2, and I4, which last was superheated. All are said - i.a. by OJ Morris (1952) - to have been failures. What else, besides superheating, was so special about the I3?Delahays (talk) 12:47, 19 November 2013 (UTC)
 * The I3 class had larger driving wheels - 6'9" diameter, as used in the B4 class instead of 5'6" - which made them much more suitable for high speed running. They also had significantly larger boilers:
 * {| class=wikitable

!Class !! I1 !! I2 !! I3 !! I4
 * Diameter ||4'3" ||4'6" ||4'10" ||4'6"
 * Barrel length ||10'10.75" ||10'10.75" ||11'5" ||10'10.75"
 * Firebox length ||5'8.25" ||5'8.25" ||7'7" ||5'8.25"
 * Heating surface ||947.5 sq. ft. ||1097 ||1269 (+ 305 sup.) ||893 (+ 215 sup.)
 * Grate area ||17.43 sq ft ||17.35 ||24 ||17.35
 * Pressure ||170 lb/sq in ||170 ||160 ||160
 * }
 * The cylinder arrangement was different, in particular piston valves were used on the I3 and I4 classes instead of slide valves. But mostly it would have been the 33% increase in grate area and the extra heating surface. -- Red rose64 (talk) 17:22, 19 November 2013 (UTC)
 * Grate area ||17.43 sq ft ||17.35 ||24 ||17.35
 * Pressure ||170 lb/sq in ||170 ||160 ||160
 * }
 * The cylinder arrangement was different, in particular piston valves were used on the I3 and I4 classes instead of slide valves. But mostly it would have been the 33% increase in grate area and the extra heating surface. -- Red rose64 (talk) 17:22, 19 November 2013 (UTC)
 * }
 * The cylinder arrangement was different, in particular piston valves were used on the I3 and I4 classes instead of slide valves. But mostly it would have been the 33% increase in grate area and the extra heating surface. -- Red rose64 (talk) 17:22, 19 November 2013 (UTC)