242A1's Recent Activity
-
242A1 replied to the thread GWR four-cylinder arrangement?.
The phenomenon of carryover was and remains a serious issue. It was addressed but needed further development work. It achieved the result of reducing lineside fires and the cost of associated insurance claims which was the leverage to get the...
Jul 11, 2026 at 10:53 AM -
242A1 replied to the thread GWR four-cylinder arrangement?.
It has a negligable effect, see the 2-4-0P. Rather like abandoning the first stage superheater and relying on the inter stage. Which makes sense when you consider how you are supposed to drive and work a compound.
Jul 10, 2026 at 8:33 PM -
242A1 replied to the thread GWR four-cylinder arrangement?.
160A1 was an experimental locomotive. It was designed to address the problems of efficiency and power output at low speeds. It gave good results but was built in 1940. Some 3 years after the proposed series of 7 types. The crank axle issue was...
Jul 10, 2026 at 2:19 PM -
242A1 replied to the thread GWR four-cylinder arrangement?.
Chapelon moved on from the six cylinder designs. In his paper read at the Sorbonne in 1933 he looked at the technological developments which had allowed a Pacific built in 1909 to be rebuilt some twenty years later with its power increased from...
Jul 10, 2026 at 12:40 AM -
242A1 liked mdewell's post in the thread PYRONAUT - 93 year old fire float.
The 93 year-old fire float 'PYRONAUT', one of the working exhibits at M Shed, was called back into action on Friday 26th June 2026 to help cool down the large swing bridge at Cumberland Basin. The extreme heat wave has been causing the bridge...
Jul 9, 2026 at 10:57 PM -
242A1 replied to the thread GWR four-cylinder arrangement?.
Chapelon proposed a three cylinder low pressure unit which would have been helpful in a number of ways. I don't know if it was ever drawn up. The Y6s had very little weight on the two carrying axles unlike some other designs which had too much...
Jul 9, 2026 at 1:14 PM
