For reference only — not a substitute for professional engineering judgement. See Terms.

Pre-filled from . Saved automatically between sessions.

Design Neutral Temp: — °C  ·  Thermal Expansion (α): — ×10−6 /°C

  • Assumes effective anchor block at the end of each stressing leg.
  • Assumes rail movement is linear along each leg during pulling.
  • Either leg may be 0 m where a single-leg stressing arrangement is used.

m
m
mm

Only input execution measurements once rails are in a stress-free state (for example, on stressing rollers).
°C
mm
mm

Enter planning and execution inputs to see stressing outputs.

Use measured anchor movement to correct expected SFT outcomes per rail and per leg.

Left Rail Corrections

mm
mm
Enter inputs above to view cross-checks.

Right Rail Corrections

mm
mm
Enter inputs above to view cross-checks.
Formula reference

Extension per leg:

E = L × α × (Tneutral − Tcurrent) × 1000

Total extension (both legs combined):

Etotal = Eleg1 + Eleg2

Rail cut for weld (per rail):

Cut = Etotal + Weld Gap − Existing Gap

Expected rail-end movement at position x along a leg:

Movement(x) = Eleg × (x / Lleg)

SFT impact from anchor movement (spread over whole stressing block):

SFT impact = −(Anchor Movement / 1000) / (α × (Lleg1 + Lleg2))

Calculated SFT = Tneutral + SFT impact