Colonel Pringle of the Railway Inspectorate found part of the broken tyre away in a field, the left-hand leading wheel of the engine having broken.
22.
The leading wheels were mounted in a spring control bogie which was designed to overcome the problems of excessive flange wear on the coupled wheels and rail cutting on curves.
23.
The coupled wheels were not spaced equidistant from each other, with a wheelbase of between the leading wheel and the driver and between the driver and the trailing wheel.
24.
They were a development of Webb's Dreadnought class; they larger driving and leading wheels, and the additions of cylinder tail rods ( which were later removed ).
25.
Under the Whyte notation for the classification of steam locomotives, a " " " locomotive has two leading wheels, six coupled driving wheels and four trailing wheels.
26.
Each engine unit has two pairs of leading wheels in a leading bogie, followed by four coupled pairs of driving wheels and two pairs of trailing wheels in a trailing bogie.
27.
Design of the cab was very similar to the P-Motors built only a year earlier, but without the long porch line structures in front that supported the leading wheels.
28.
This was necessary in the case of the SECR / SR Moguls because there was insufficient space for Holcroft's original gear to fit between the cylinder leading wheels and first drivers.
29.
The rebuilding also involved several changes, such as redesigning the locomotives'fireboxes to burn oil instead of coal and wood, as well as the addition of leading wheels and trailing wheels.
30.
The immediate cause of the incident was the reversal of the points by the signalman at Ropley Signal box at the same time as the leading wheels of the train were passing over them.
