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DONCASTER WORKS

 

PART 18  -  IVATT BOILER CLASSIFICATIONS

 

Boiler Types were introduced around 1900. The columns below show two early Ivatt types, later Gresley GNR Diagram number (where known), LNER Diagram number (where appropriate). This list is sorted in order of Column 2. The information in the first two columns is based on notes made by Roy Burton, senior draughtsman in Doncaster Locomotive Drawing Office until 1959.

 

Early

Ivatt

type

Later

Ivatt

type

Gresley

Dgm.

LNER

Dgm.

Ivatt Engine Classes

A3

A1

 

 

A1

A1

A2

 

 

A2

A2

A3

 

 

A3

B1

B1

 

 

B1

B2

B2

 

 

B2

B3

B3

 

 

B3, B4

B4

B4

 

 

A4, A5

C5

C5

 

 

B6

D1

D1

4

11

B7, C2, D2, E1, E4, F3, G4, J5, J8, J16

C6

D3

 

 

B5, E2, E3

D3

D4

 

 

F2

D4

D6

 

 

J6

D5

D7

 

 

J7

D6

D8

4a

 

G3

D8

D9

4a

 

J17

D9

D10

 

 

J9

D10

D11

 

 

J10

E1

E1

6

7

D1

F1

F1

2

4

C1, K1

F2

F2

2

4

C1 No. 271

J1

H1

 

 

F1

L1

J1

 

 

F6

K1

J2

 

 

F4

O1

J3

 

 

G2

M1

K1

 

 

F5

P1

K2

 

 

J1, J2, J3

N1

L1

 

 

F7,G5

Q1

M1

 

 

J4

R1

N1

 

 

J11, J12 *

S1

O1

10

9

J13

T1

P1

 

 

J14

U1

Q1

 

 

J15

V1

Q2

 

 

J18

W1

R1

 

 

J19, J20

X1

S1

 

 

H1

 

* "GREAT NORTHERN LOCOMOTIVE HISTORY" (Norman Groves) notes that in the January 1902 Boiler Classifications, Classes J11 and J12 were in Boiler S1. There were thus more changes in the classification than suggested in the table above.

 

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