Build a Bodmer competition (not)!
In 1845 the Swiss engineer John George Bodmer constructed a pair of 2-2-2 locomotives at his Manchester workshops for the Joint Committee of the Brighton, Croydon and Dover Railways. Born in Zurich in 1786 and later apprenticed to a millwright, the young engineer showed much promise and a strong talent for innovation. He moved to Lancashire in the 1820s but continued his connections with Switzerland and Baden in Germany. His particular invention was that of an opposed cylinder steam engine in which two pistons moved in opposite directions driving two crankshafts, a 'balanced' engine. He continued to expand this idea and the two locomotives for the Joint Committee were his most famous, or perhaps infamous, machines.
Purchased for £2100 the Committee took delivery of the engines in July and December 1845 and numbered them 123 and 124. The locomotives each had a pair of double pistons, the conrod of one passing through the hollow conrod of the other. This complicated arrangement was powerful but very costly to maintain. The tenders supplied were carried on six wheels with a mechanically driven feed pump mounted between the frames to feed the loco via a substantial hollow pipe which also served as the coupling between tender and loco! Typically the loco itself had no brakes but the tender sported huge wedges of timber with iron shoes which when wound down, wedged themselves between the wheels and the rails which in extreme circumstances could lift the tender clear of the rails altogether. Predictably this had disastrous consequences and the engine allocated to the SER after the dissolution of the Joint Committee left the rails at Pluckley on the 23rd May 1846 killing the driver. However a subsequent enquiry proved that a large stone left on the line by errant youths was the cause of this particular accident. Unfortunately this did nothing to assuage the opinion that this 'foreign' locomotive was more trouble than it was worth and after some modifications and very little further service the loco was sent to Ashford where it languished until being dismantled in 1880.
The Brighton engine had better luck although it was rebuilt first by Craven, then again by Stroudley who even saw fit to name it 'Seaford'. Thankfully a photo exists of it in this guise but it can be seen that not a great deal of Bodmers original design survived, certainly not his balanced pistons which did not survive the Craven rebuild.
And so to the model. A friend of mine declared that he was going to build Seaford which prompted my response that i was intending to build the 1845 version. "Let's build them simultaneously and do a joint article for the HMRS" he said. "Great idea" I replied not fully aware of what I was letting myself in for.
Nevertheless the short straw had been drawn and everything else put on hold to scratch build Bodmers 1845 balanced locomotive in 4mm scale to EM standards. Since nothing about it is conventional it has tried my patience to the extreme and progress in painfully slow, however I hope the following photos show that it is at least getting somewhere and I hope to be able to add to this blog in a positive manner in the not too distant future.
If you never hear from me again you'll know it didn't go well!
Portescap gears in a scratch built box to get them in the right positions.
It fits, just!
Haycock firebox. I hate doing these....!
Frames and springs. The trailing springs were double coil springs hidden in the axle guide casting as per the tender.
The story so far.....
Thanks for looking!
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