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| Symbol | Definition |
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| Axial and lateral deformation in the x, y, and z directions, respectively |
| Axial and lateral velocity in the x, y, and z directions, respectively |
| Axial and lateral acceleration in the x, y, and z directions, respectively |
| Torsion angle around x direction |
| Warping factor definition |
| Stiffness factor per unit length of the beam in the x, y, and z directions, respectively |
| Rotational stiffness factor per unit length of the beam |
| Damping factor per unit length of the beam in the x, y, and z directions, respectively |
| Rotational damping factor per unit length of the beam |
| Mass per unit length of the beam |
| Rotational mass inertia per unit length of the beam |
| Modulus of elasticity |
| Area section |
| Warping factor |
| Kinetic energy |
| Potential energy |
| Nonconservative works |
| Mass density |
| Strain of beam model |
| The second moment of area in the x, y, and z directions, respectively |
| Second polar moment of area |
| Distance between shear center and bottom level of the rail |
| Moving point load in the x, y, and z directions, respectively |
| Concentrated rotational moment around the x axis |
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