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Mr. J. Ramsbottom
1858 — DX Goods
1863 — 4ft Shunter
1870 — Special Tank
Mr. F.W. Webb
1873 — 17in Coal Engine
1880 — 18in Goods
1881 — Special DX
1881 — Coal Tanks
1893 — ‘A’ class
1894 — Crane Tank
1896 — Dock Tank
1901 — ‘B’ class
1903 — 1400 Class
Mr. G. Whale
1904 — ‘C’ class
1904 — ‘E’ class
1906 — ‘D’ class
1906 — ‘F’ class
1906 — ‘G’ class
1912 — ‘G1’ class
1906 — 19in Express Goods
Mr. C.J. Bowen Cooke
1911 — 1185 class
Capt. H.P.M. Beames
1923 — 380 class
Ex GCR
1919 — ‘MM’ class
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Special DX
Vital Statistics |
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| Official Name |
Six-Coupled Engine |
| Nickname |
Special DX |
| Water & Coal Storage |
Tender |
| Water Capacity |
2,000 gallon |
| Coal Capacity |
? tons |
| Wheel Arrangement |
0-6-0 |
| Driven Wheels |
Six 5ft 2in |
| Carrying Wheels |
none |
| Wheelbase |
7ft 3in + 8ft 3in |
| Boiler |
4ft 2in diameter; 10ft 6in long |
| Boiler Pressure |
? psi |
| Grate Area |
? sq.ft. |
| Tubes |
? |
| Total Heating Area |
1,099 sq.ft. |
| Cylinders |
Two inside 17in diameter; 24in stroke |
| Weight |
? tons ? cwt |
| Designer |
Mr. F.W. Webb |
| Number in Class |
? |
| Lifetime |
April 1881— |
The design of locomotives generally evolved, but sometimes in an
uncertain way and exceptions always existed. It was not always clear
when a development became significant enough to mark a new design
change: In April 1881 Mr. Webb  started rebuilding DX’s with a
new boiler with the pressure increased to 150 psi
but it was only when they were also fitted with vacuum brakes
for working passenger trains that they became known as
‘Special’ (or vacuum) DX’s. They normally had:-
- Circular Webb smokebox doors
- 1800 gallon tenders
- Closed splashers and safety valves
- Wooden steam-powered brakes on the engine
- A higher-pitched boiler
- Chimney shortened from 4ft to 3ft 9in
- conventional circular-bossed coupling rods
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