RMweb Premium Mark Forrest Posted August 19, 2012 RMweb Premium Share Posted August 19, 2012 Mark, what were the axle loads of the stock we're running? Initially we are looking at bogie bolster C and E which have a gross laden weight of somewhere between 40 and 45 tonnes over 4 axles. If we future-proof to allow for more modern stock we would be looking at more like 80 tonnes for a BDA (again over 4 axles) - although presumably there were locations on the real railway where these were used (for theoir length), but not loaded to their maximum weight capacity. Link to post Share on other sites More sharing options...
RMweb Premium Mark Forrest Posted August 19, 2012 RMweb Premium Share Posted August 19, 2012 Thinking about the issue of loco and loaded wagons being on the bridge at the same time, could we have a rule that the bogie wagon nearest the loco is unloaded? A match wagon type of thing?? No idea if there is a prototype for this, but it sounds like a bostin' excuse to (a) build some grotty internal user wagons (b ) engage in some additional shunting moves before setting off from the exchange sidings. 2 Link to post Share on other sites More sharing options...
Katier Posted August 20, 2012 Share Posted August 20, 2012 Hope your planning on making this fine bridge out of brass and wood Not sure if it helps with beam height calculations but don't forget the bridges on the old tettenhall line are still in-tact and while being probably a bit more substantial than your bridge are publically accessible and thus easy to measure/access (and are contemporary with the layout). 2 Link to post Share on other sites More sharing options...
RMweb Premium 2ManySpams Posted August 21, 2012 RMweb Premium Share Posted August 21, 2012 Our latest blog update can be found here Link to post Share on other sites More sharing options...
RMweb Premium 2ManySpams Posted August 21, 2012 RMweb Premium Share Posted August 21, 2012 Our latest blog update can be found here Link to post Share on other sites More sharing options...
RMweb Gold griffgriff Posted August 21, 2012 RMweb Gold Share Posted August 21, 2012 I like the 'Paddington Bear' structures 1 Link to post Share on other sites More sharing options...
RMweb Premium 2ManySpams Posted August 21, 2012 RMweb Premium Share Posted August 21, 2012 I like the 'Paddington Bear' structures I'm thinking that doing the whole layout like that will save a shed load of time. Can't see Andy Y or BRM being happy though! Link to post Share on other sites More sharing options...
Andy Y Posted August 21, 2012 Share Posted August 21, 2012 Oh I dunno; it has a certain minimalism, pure white landscape with some mock-ups and a marker pen. There may be a problem in getting Old Gringo to adopt crayons though. 3 Link to post Share on other sites More sharing options...
RMweb Premium 2ManySpams Posted August 21, 2012 RMweb Premium Share Posted August 21, 2012 Nice. I'm guessing John spends more time on his drawings than me with a marker pen.... Link to post Share on other sites More sharing options...
RMweb Premium skipepsi Posted August 21, 2012 RMweb Premium Share Posted August 21, 2012 I found this it contains all sorts of background details and views. http://www.youtube.com/watch?v=-f8LYXF1-2s&feature=relmfu 4 Link to post Share on other sites More sharing options...
RMweb Gold Captain Kernow Posted August 22, 2012 RMweb Gold Share Posted August 22, 2012 (edited) How far has it traveled? It's like waiting for Christmas. Here's the reason it hasn't found Birmingham yet... somehow found it's way to Sweethome, Alabama... (evidently looking for the wrong Birmingham...) Edited August 22, 2012 by Captain Kernow 2 Link to post Share on other sites More sharing options...
Portchullin Tatty Posted August 22, 2012 Share Posted August 22, 2012 1/10th of the span for the main girders is not a bad rule of thumb for the depth of a railway bridge girder; above 1/12th sounds rather delicate for a railway bridge. The dynamic loads that railway locos introduce are much more significant than for a road bridge so they will generally be more "beefy" than a road equivilent. I would say not less than 15 inch for the way beams and I suspect that the transoms (what you called "5-6mm girders" ought to be not less than 12 inches but probably on a more regular spacing than you are showing of 24inch - they are also likely to be girders as you note. Your bridge abutment looks good, but remember wing walls or is it going into a retaining wall? With regard to sources, the Wills "varigirder" kit is actually very good. On mine, I introduced stiffening plates between each plate as this was a more common form. I did think the top plate was a bit chunky and upon reflection I should have made this from brass with my rivet tool (use the GW Models one, it is excellant for doing rows of rivets that match perfectly). This would equate to a girder depth of circa 6 feet, which feels typical to me. This is what mine looked like: Alternatively, an even better solution would be to use the Masokits etched brass girder kit. See page 5 of this link http://www.scalefour...kits/index.html. I think Waterloo Road used one - didn't you James? Bridges have tended to hang around for a long time, many that we travel over today date from well back into the Victorian era if not the initial construction of the lines. Prior to circa 1880, plate girders were less common and lattices were used. Bolted plate girders would be good until WWII, where welding really took off. All very big generalisations, so don't lets get into finding the exceptions, but in broad terms these principals are about right. 5 Link to post Share on other sites More sharing options...
RMweb Gold Oldddudders Posted August 22, 2012 RMweb Gold Share Posted August 22, 2012 Perhaps the driver was listening to this? Link to post Share on other sites More sharing options...
iL Dottore Posted August 23, 2012 Share Posted August 23, 2012 Interesting discussion about bridges. Before reading this thread, I was under the impression (to paraphrase Gertrude Stein) "a bridge is a bridge is a bridge" and would have happily plonked down Dapol's Girder Bridge on my layout, regardless of traffic type (mostly beer wagons if you must know). I obviously have a lot to learn before I could add "bridge building", to my list of construction skills. Great Stuff F By the way, 2manyspams, you have a PM Link to post Share on other sites More sharing options...
Steve Williams Posted August 23, 2012 Share Posted August 23, 2012 *That's what they were referred to then, obviously this would be 'Travelers' in 2012.... ...but they never want to go anywhere. Link to post Share on other sites More sharing options...
Andy Y Posted August 23, 2012 Share Posted August 23, 2012 The Wednesday night Division of Labour summit saw four out of the five boards back together in the same county to look at the next steps after Chris (2manyspams) had littered Leicestershire with polystyrene. Once he'd filled all the neighbours' bins with his waste we were granted access to the workshops and John (Old Gringo) comes up with the idea that any redundant plans can be used to papier mache the csnerey. Damian (Indomitable026) at the back of the garage wonders why he hasn't been offered a cuppa. John tries to out-stare Andy (wagonbasher) over a point of debate. Damian now has a cuppa and his Action Man swivelling eyes turn to see if Andy has cracked yet. As the night draws in some beer has helped the allocation of tasks whilst John has found more plans to festoon the boards. The fact that Geoff hasn't brought any track along hasn't deterred Mark from playing trains with his pink Janus. Serious business this layout building. That said it has to be said that the scope, subtlety of topography ably interpreted from John's drawings into polystyrene by Chris and the fidelity of the layout is excellent. 11 Link to post Share on other sites More sharing options...
RMweb Premium 2ManySpams Posted August 23, 2012 RMweb Premium Share Posted August 23, 2012 It wasn't me Guv. Link to post Share on other sites More sharing options...
RMweb Gold Worsdell forever Posted August 23, 2012 RMweb Gold Share Posted August 23, 2012 Cracking progress, is that Janus scratchbuilt? 2 Link to post Share on other sites More sharing options...
trisonic Posted August 23, 2012 Share Posted August 23, 2012 Did Johnny Gringo arrive by bike? John, sorry, I know I owe you a PM missive...... Best, Pete. Link to post Share on other sites More sharing options...
Old Gringo Posted August 24, 2012 Share Posted August 24, 2012 No worries, Pete. Hope you're enjoying the pictures of "the BCB team at work". Drinking tea and beer and twiddling with a biro in a nice clean garage. Just the job! All the best, John. Link to post Share on other sites More sharing options...
RMweb Premium wagonbasher Posted August 24, 2012 RMweb Premium Share Posted August 24, 2012 Cracking progress, is that Janus scratchbuilt? It is scratch built, but it will need further work to get it to the standards you are expecting Andy 3 Link to post Share on other sites More sharing options...
trisonic Posted August 24, 2012 Share Posted August 24, 2012 No worries, Pete. Hope you're enjoying the pictures of "the BCB team at work". Drinking tea and beer and twiddling with a biro in a nice clean garage. Just the job! All the best, John. I got a very real sense of the internal politics from Andy's photos, not to mention the "majesty" of a couple of Pie fueled bellies. It reminded me of those photos from the Situation Room when the guys went after Bin Laden. Best, Pete. 4 Link to post Share on other sites More sharing options...
Steve Williams Posted August 24, 2012 Share Posted August 24, 2012 I got a very real sense of the internal politics from Andy's photos, not to mention the "majesty" of a couple of Pie fueled bellies. It reminded me of those photos from the Situation Room when the guys went after Bin Laden. Best, Pete. You mean this one?: 11 Link to post Share on other sites More sharing options...
Mythocentric Posted August 24, 2012 Share Posted August 24, 2012 (edited) I love that look on Hilary Clinton's face...."Oh Lord...tell me they're not going to dump that Cortina in the canal!". Edited August 24, 2012 by Mythocentric 5 Link to post Share on other sites More sharing options...
RMweb Premium Mark Forrest Posted August 25, 2012 RMweb Premium Share Posted August 25, 2012 I think I may have found a suitable brake lever for the bogie bolsters, on the Mainly Trains MT230 wagon brake gear detailing etch. All being well I'll have a go at test fitting one later to check them out for size. Link to post Share on other sites More sharing options...
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