AAR PLATE L CLEARANCE • 36-AXLE SCHNABEL • DYNAMIC CANTILEVER TELEMETRY
SMR Schnabel Railcar Span & Deflection Calculator
Simulate mid-span center sag, cantilever arm bending moments, track curvature lateral overhang (middle ordinate), and Top-of-Rail (TOR) clearance for factory-built SMR modules.
SMR & Railcar Parameters
VESSEL WEIGHT (METRIC TONS):
520 T
SPAN BETWEEN CANTILEVER PIVOTS:
22.8 m (74.8 ft)
HYDRAULIC LIFT OFFSET (TOR):
+6.0 in
TRACK CURVATURE DEGREE:
4.0° (R = 1,432 ft)
Live Schnabel Truss & Vessel Deflection Profile
AAR PLATE L: COMPLIANT
MID-SPAN DEFLECTION
1.34 in
34.0 mm flexural sag
CANTILEVER MOMENT
12,840
kip-ft per arm
AXLE TRACK LOAD
46,200
lbs/axle (Limit: 52k)
CURVE MIDDLE ORDINATE
7.8 in
lateral inside drift
AAR Rule 88 Heavy-Duty Rail Clearance Analysis:
Bottom of Vessel to Top of Rail (TOR Clearance):
14.66 in (Min: 6.0 in) — PASS
Rail Curvature End Swing (Overhang at Pivot Ends):
4.2 in outward drift
Dynamic Cantilever Hydraulic Adjustment Margin:
± 8.0 in vertical / ± 12.0 in lateral
Bridge Deck Equivalent Cooper E-Rating:
Cooper E-72 Compliant (FRA Track Class 3/4)
Export Clearance Envelope & Route Bridge Study
Download complete Class 1 railroad routing profile (BNSF, UP, CSX, Norfolk Southern) and bridge load ratings for this specific vessel configuration.
Engineering Calculation Methodology & Reference Codes
AAR Standard S-286 & Plate L
Governs maximum permissible outside dimensions for heavy-duty railcars. Middle ordinate clearance reductions are calculated using $M \approx L^2 / (8R)$ to prevent contact with tunnel portals and trackside signal bridges.
AISC / AREMA Chapter 15 Steel Structures
Evaluates cantilever arm truss stresses and deflection under combined dead load plus 10% dynamic vertical impact factor ($1.10 \times W$).
ASME Section III Division 1 NB-3000
Restricts vessel shell transport induced bending stresses to less than $0.33 \times S_m$ to ensure zero micro-yielding of forged SA-508 reactor vessel walls.