none 

Statements about this table:
the cylinder size of a radial - stay firebox be 20 ½ x 26
there be 32 engine build in 1906 - 08
the engine with a cylinder size of 20 ½ x 26 and a firebox of radial - stay be build in 1901 - 02
a slide valve be use on the engine build in 1902 - 05
the cylinder size for the e2a belpaire be 22 x 26
the valve for the e7s class , belpaire firebox be slide , not piston
the 20 ½ x 26 cylinder size from 1903 - 04 have a slide valve
class
firebox
cylinder size
valves
valve gear
number built
years built
e2
radial - stay
20 ½ x 26
slide
stephenson
88
1901 - 02
e2a
belpaire
20 ½ x 26
slide
stephenson
93
1902 - 05
e2b
belpaire
20 ½ x 26
piston
stephenson
70
1903 - 04
e2c
belpaire
20 ½ x 26
slide
stephenson
22
1903
e2d
belpaire
20 ½ x 26
piston
walschaerts
32
1906 - 08
class
firebox
cylinder size
valves
valve gear
number built
years built
e3
radial - stay
22 x 26
slide
stephenson
8
1901 - 02
e3a
belpaire
22 x 26
slide
stephenson
114
1903 - 05
e3d
belpaire
22 x 26
piston
walschaerts
56
1906 - 10
e7s
belpaire
22 ½ x 26
piston
stephenson
90 conv fr e2a , b , c
1916 - 20