Tim Allen Posted July 28 Share Posted July 28 (edited) To me without typing a wall of text and keeping things as simple as possible you have two options: 1 Test Blink Bonny - Build the basic Radius 3 starter oval, which we know the loco should be able to travel round without derailing. Make sure the track is flat and level with no damaged track pieces. Send it 15mins in each direction clockwise, anticlockwise, backwards as well as forwards and if it keeps derailing then a call to CS for a return. If not re-design the layout in the offending section. Or 2 Test the current Layout - Put a different loco on the current layout and see if it derails in the same area. If it does then re-design the layout, if not contact CS and have Blink Bonny returned. Job done, no need for war & peace or equations for life, the universe and everything. 🙂 Edited July 28 by Tim Allen Link to comment Share on other sites More sharing options...
Kenneth-365689 Posted July 28 Share Posted July 28 (edited) I see what you mean, but sometimes it's best to explore all and any possibilities, even the stuff I come up with.. 🙄 (in response to B's post, not Tim's). Edited July 28 by Kenneth-365689 Clarification Link to comment Share on other sites More sharing options...
What About The Bee Posted July 28 Share Posted July 28 17 minutes ago, Kenneth-365689 said: ...even the stuff I come up with.. 🙄 Can be no worse than my stuff 😁 Link to comment Share on other sites More sharing options...
Silver Fox 17 Posted July 29 Share Posted July 29 6 hours ago, What About The Bee said: Correct @Silver Fox 17, no one is forcing you to do it. You do not have to have it. Bee No but you said "you had to do it" which is incorrect. Link to comment Share on other sites More sharing options...
What About The Bee Posted July 29 Share Posted July 29 Definitions Requirement : a thing that is compulsory; a necessary condition. Recommendation : a suggestion or proposal as to the best course of action 22 minutes ago, Silver Fox 17 said: No but you said "you had to do it" which is incorrect. I suggest you produce those exact words. We both know you can not. I am a reasonably disciplined correspondent and am careful with my words. I did say "Back to back opposite turns without an intermediate straight is a recommendation, not a strict rule." Perhaps you can locate that statement when you search my posts, in an attempt to prove yourself right, yet again. Good day sir. Bee 1 Link to comment Share on other sites More sharing options...
Silver Fox 17 Posted July 29 Share Posted July 29 (edited) On 25/07/2024 at 20:40, What About The Bee said: Back to back opposite turns are a no no. There must be a sufficient length of straight between them. Your statement and saying things are a "no no" means you should not and something must be done about it you never mentioned a recommendation. Then saying "there must be a sufficient length of straight between them" is enough to make a decision that you are incorrect. End of. Edited July 29 by Silver Fox 17 Link to comment Share on other sites More sharing options...
What About The Bee Posted July 29 Share Posted July 29 I said good day sir @Silver Fox 17 Link to comment Share on other sites More sharing options...
moawkwrd Posted July 29 Share Posted July 29 This is all a very silly discussion considering the 1st picture shows a standard straight section after/before the curved anyway… 1 Link to comment Share on other sites More sharing options...
Rallymatt Posted July 29 Share Posted July 29 (edited) Another issue that did affect some early TT locos was out of alignment chassis, that can cause a number of issues such as driving wheels trying to climb up rails and in some situations that can derail as the image shows. Testing in a few different track formations and directions, usually slow speed often highlights if this is the issue. It can also happen if drive wheels are misaligned on chassis or the gauging is out. Edited July 29 by Rallymatt Link to comment Share on other sites More sharing options...
Hobby11 Posted July 29 Share Posted July 29 It's the same thing as "transition" curves which are used on the real railways to allow smooth running but hardly ever used on model railways, and never when using set track! The main issue with reverse curves is when propelling a train, for instance into a fan of sidings, yes it can be done, but it's more likely for things to go wrong! The key is to slow down!! Link to comment Share on other sites More sharing options...
dBerriff Posted July 29 Share Posted July 29 If you have a cross-over on a (model) two-track layout then you have reverse curves. Treat it as an excuse to add appropriate speed signs - West Hill Wagon Works make a set. 2 Link to comment Share on other sites More sharing options...
ntpntpntp Posted July 29 Share Posted July 29 Wondering whether the derailment of the rear driving wheels could be due to the un-flanged trailing wheels maybe catching on something if the track's not level? Lifting the rear of the loco and allowing the wheels to derail? As with all derailment scenarios it's necessary to spend some time running the loco slowly over the section of track where it occurs and observing closely exactly what's happening to cause the problem. 2 Link to comment Share on other sites More sharing options...
Rog RJ Posted July 29 Share Posted July 29 Looking at the fourth picture the tender looks very close to the loco. Can it be confirmed that no contact is happening? Link to comment Share on other sites More sharing options...
Rallymatt Posted July 29 Share Posted July 29 It shouldn’t @Rog RJ as there is only 1 drawbar setting on TT:120 locos, I think @Silver Fox 17 has had these round the very tight radius on the old Triang TT3 track without issue. I know on OO they started putting a close couple hole in for display or very large radius layouts. 1 Link to comment Share on other sites More sharing options...
Silver Fox 17 Posted July 29 Share Posted July 29 1 minute ago, Rallymatt said: It shouldn’t @Rog RJ as there is only 1 drawbar setting on TT:120 locos, I think @Silver Fox 17 has had these round the very tight radius on the old Triang TT3 track without issue. I know on OO they started putting a close couple hole in for display or very large radius layouts. That's right Matt, I have had the A1, A4, class 50 and the Mk1 and Staniers all around Triang TT small radius curves without any issues. 1 Link to comment Share on other sites More sharing options...
Rog RJ Posted July 29 Share Posted July 29 (edited) @Rallymatt I thought that was the case but you never know Edited July 29 by Rog RJ 1 Link to comment Share on other sites More sharing options...
Silver Fox 17 Posted August 4 Share Posted August 4 This is just to show the locos will go around reverse curves without straights between left and right turning and without any issue. The curves here are even tighter than Hornby R1 and there are 4 sets of reverse curves in this church open day loose lay layout. A straight between is a good idea but is NOT a requirement. 4 Link to comment Share on other sites More sharing options...
RB51 Posted August 4 Share Posted August 4 Fair old speed too. R- 1 Link to comment Share on other sites More sharing options...
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