Investing in high quality
NA25 shall be easy to make
Being aware of existing problems and costs on such locations avoided by investing in high quality NA25 – decision in favour of NA25 shall be easy to make. Why then NA25 and not other fellow concepts also claiming high quality?
Please read further: NA25 is in standard and by concept providing what has been requested but has been regarded ”mission impossible”. As well isolating as damping (simultaneously) is one new, unique advantage with NA25. Still basically standard track technology is used. Any high quality track (as NA25) – shall compared with older do standard track improve and maintain:
- distribution of wheel/axial loads along rail good, for maintained min. force on each support,
- amplitude of pulsating forces reduced, all the way – on wheel, rail, support structure etc.,
- energy induced upon system reduced to minimum (less energy wasted),
- hysteresis, by safe contact damping, good all the way from each individual ballast particle to wheel/rail area (loaded or unloaded track),
- resonance’s (natural vibration) freq. as few as possible in ”problem” area (e.g. ”well known” rail pinpin freq. is transferred to higher freq. area and there also dampened.
a) any standard rail – UIC60 etc. and known techniques for construction and maintenance allowed for etc.
b) NA25 constitutes PW (permanent way). Destroying/disturbing ”maintenance” – grinding, tamping – is reduced to minimum.
c) NA25 allows for construction/maintenance tamping without damaging (crushing) of ballast stones.
d) NA25 high quality track system is self-curing as: Speed dependant rail corrugation, caused by interference (resonance) at rail ”pinpin” frequency, is extremely ”short pitched” and thereby corrugation is in fact suppressed under mixed traffic. Hung sleepers are also by self curing aligned to neighbour higher, supported fellow sleepers as these simply are suppressed/aligned when hit by abnormal higher loads caused by hung sleepers (not distributing their complete, nominal load).
e) dynamic alignment (receptance) good – less total max forces and less amplitude of forces.
f) safe – track movements minimal, temperature forces safely and evenly distributed. Stabile consolidated, stabile tracked maintained for longer periods – less disturbing/risky maintenance tamping requested, acceleration/braking capacity improved,
g) costs for tunnels minimized, steeper sloping gradients allowed.
h) rail/wheel noise minimal.
h) improved riding comfort: improved track alignment, less demand for speed limits.
i) higher net axial/wheel loads and speed allowed, improved and safer distribution of axial load, dynamic, system related load less.
j) less wear on track and rolling material.
k) NA25 is versatile, flexible – which among others means – NA25 track is with option for high speed air proof function (aerodynamic, low air friction), less risks for loose stones etc.
k) opens for new design of future wagons/boogies, safer, less energy wasting, silent.