This was mostly an issue for steam locomotives, where the popular technique at the time of making connecting and coupling rods from rail required an excessive spacing between wheel faces and the cylinders.
42.
Following the removal of the knuckle joints from the coupling rods, flanges from the second coupled and driving wheels and the fitting of boilers standard for 55 class, they became most useful locomotives.
43.
The valve gear, brake gear and the hubs on the coupled wheels were fitted with soft grease lubricating nipples, while the bronze axle boxes and connecting and coupling rods had hard grease lubrication.
44.
Each piston is connected to the driving axle on each side by a connecting rod, the driving wheels are connected together by coupling rods to transmit power from the main driver to the other wheels.
45.
The locomotive's mechanical transmission consisted of a single, frame-mounted traction motor powering a jackshaft drive via a reduction gear; the jackshaft drove all three driving axles via connecting rod and coupling rods.
46.
The throttle valve, link rod, brake, and coupling rods, and the connection between the driving boxes for producing pressure against the rails, were operated by hydraulic power, although hand levers were also provided.
47.
The flanges of the second and third driving wheels were made thinner, and the coupling rods between the third and fourth sets of driving wheels used spherical joints, all to create side play and hence flexibility in operations.
48.
Although Sentinel were to become known for gear-driven locomotives, other examples of this conversion of an older coupling rod locomotive continued to be produced; two examples survive, although derelict, at the Coalbrookdale Museum of Iron.
49.
The tank vent was found to restrict the driver's vision and was moved further forward from 80059 . Initially built with fluted coupling rods, these caused problems on other classes and from 80079 plain section coupling rods were substituted.
50.
The tank vent was found to restrict the driver's vision and was moved further forward from 80059 . Initially built with fluted coupling rods, these caused problems on other classes and from 80079 plain section coupling rods were substituted.
