LMS2968s letzte Aktivitäten
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LMS2968 antwortete auf das Thema GWR four-cylinder arrangement?.
'Best' is a word rather open to interpretation; you need to specify from which point of view they were 'Best'. As you say the Compounds had their weaknesses and the main one was size - or lack of it. They were more than big enough for the...
24 Juni 2026 um 13:25 -
LMS2968 gefällt marshall5s Beitrag in dem Thema GWR four-cylinder arrangement?.
I don't think that it was "special" as it was a commonly used arrangement in the U.S. but the downside was a 'weak' front end requiring the use of braces to the smokebox. With the use of continuous frames and separate cylinder castings on the...
24 Juni 2026 um 09:58 -
LMS2968 antwortete auf das Thema GWR four-cylinder arrangement?.
Sorry, but wrong way around. The Compound regulator was an ingenious bit of kit and allowed the unskilled driver to drive them effectively. At small openings live steam was fed to the two low pressure cylinders to allow starting, at the same time...
24 Juni 2026 um 08:25 -
LMS2968 antwortete auf das Thema GWR four-cylinder arrangement?.
The Midland (from W.M. Smith (North Eastern) Compounds system worked well and they were, for their size, good and strong machines. I don't have figures for their coal consumption but since these would be comparisons against, say, Claughtons and...
24 Juni 2026 um 06:43 -
LMS2968 gefällt Jamessquareds Beitrag in dem Thema GWR four-cylinder arrangement?.
I'm reminded of Adams' trial of the Wordsell-von Borries system (a two cylinder compound) on one of his 4-4-0s. It worked OK, and saved a small amount of coal, but that was more than outweighed by the additional lubrication demands, such that it...
24 Juni 2026 um 06:31 -
LMS2968 antwortete auf das Thema GWR four-cylinder arrangement?.
Not so the second driving axle having to deal with offset torque and massive torsional stresses. Not a huge problem in a country like Britain sitting on massive reserves of cheap coal, so the building and maintenance costs became the dominant...
23 Juni 2026 um 20:27 -
LMS2968 antwortete auf das Thema GWR four-cylinder arrangement?.
That makes Francis Webb's three-cylinder compound system seem quite sensible! It's basically the same but with one less High pressure cylinder.
23 Juni 2026 um 18:44 -
LMS2968 gefällt GWR4707s Beitrag in dem Thema Bahamas.
Is there a reason its being placed in the frames rather than in a more accessible location, the pump on 46100 is behind the smoke deflector IIRC and so accessible but it seems odd (no doubt there is a perfectly valid and sensible reason) to place...
23 Juni 2026 um 10:45 -
LMS2968 gefällt Steves Beitrag in dem Thema Bahamas.
The vacuum brake is about as fail safe as a brake can be unlike an air brake as the triple valve or distributor can fail to operate. It relies on the fact that there are multiple distributors on a train and multiple failure is highly unlikely....
23 Juni 2026 um 07:12 -
LMS2968 antwortete auf das Thema Bahamas.
The two systems work on very different principles and the mass of air to be moved in a vacuum system is much greater than in an air system, so it requires more time to, for instance, fill and drain a cylinder. Look tat the thickness of an air...
22 Juni 2026 um 16:32 -
LMS2968 antwortete auf das Thema Bahamas.
The different air / vacuum (air pressure in reverse) are compensated by the use of bigger cylinders for a vacuum system so equalising the brake effort. A vacuum brake can be just as effective as an air system although slower acting, hence the...
22 Juni 2026 um 15:57
