Many thanks for all that ‘top’ work, Dave (
@Yorkshire Dave )
Truly magnificent and very easy to follow. As for the 3D plan: I’m there
I realised quite early on with my Heath ‘what’s-his-name’ affair using pencil n scissors, that the standard Setrack curves weren’t going to ‘cut-it’, and would have to be ‘bespoken’, and I was always of a mind to use flexitrack for the straight bits simply to save on funds
I’m afraid my gradient calculations were reached using more fundamental methods: just a ball of string…….
How I envisaged the gradients: incline, starts from the straight section of the curves to the left of the drawing above, and ceases approx 6 inches short of the curved point forming part of the crossover on the entry to the station. Allowing say 3.75” for the ‘fall’ in track over the eleven foot length measured with my parcel string implement, I reached a gradient figure of under 3%. Decline: a figure ‘the wrong side’ of 5% for the outward bound line before it reaches the tunnel, but definitely no slippery wheels in this case
How I attained the extra length to mitigate ‘the climb’ without compromising tunnel height ‘below’ the station so to speak, was to allow the track to be open on the full length of curve, in the interests of better running i.e. easier to reach for track cleaning, the whole being made to look like it was in one of those ‘freight line’ cuttings that dived down from the main ‘overhead lines’ like that at Blackfriars. Incidentally, I’m quite fond of our American cousins’ preference for the word ‘dove’ in usage here
I digress. The problem with this scenario, as it transpired, was that by including a parallel loop to hold the odd loco - again of my own invention- it would also have to be on this incline; not a problem per se for a stationary loco - no rolling backwards - but the curved points forming the loop would also be on the incline, a situation I’m trying to avoid
I might indeed have to bin the notion.
Talking of avoiding bent points on hills, Dave, in light of your kind research on my behalf, it looks like I might just have to site the crossover on the gradient(s) in the station throat after all if I’m to avoid the heartache of slippery wheels on slope, so thanks for pointing this out
Looks like an imposed speed limit might just well be the order of the day; until we’re over ‘em
Sorry the above diatribe is not as clear as your wonderful diagrams, but I do hope you manage to follow at least some of it
Cheers, Dave
Jon