Sample Input File - 1st Example in Paper

*Heading
 1st Example Problem, Yang & Yau (1997). Units: N-m-s
*Parameter
Nel = 50
Nx, S1, S2 = Nel+1, Nel+2, Nel+3
********************** Refined Mesh ************************
*Node, Nset=Bridge-L
 1, 0.0, 0.0
*Node, Nset=Bridge-R
 <Nx>, 25.0, 0.0
*Node, Nset=Vehicle-B
 <S1>, 0.0, 0.0
*Node, Nset=Vehicle-T
 <S2>, 0.0, 1.0
*Ngen, Nset=Bridge-Nodes
 1, <Nx>
*Element, Type=B21
 1, 1, 2
*Elgen, Elset=Bridge-Elements
 1, <Nel>
*Beam General Section, Section=General, Elset=Bridge-Elements, Density=23.03
 100.0, 2.94, 0.0, 2.94
 0.0, 0.0, -1.0
 2.87E9, 1.1958E9
*Element, Type=SpringA, Elset=Vehicle-K
 <S1>, <S1>, <S2>
*Element, Type=Mass, Elset=Vehicle-M
 <S2>, <S2>
*Spring, Elset=Vehicle-K

 1.595E6
*Mass, Elset=Vehicle-M
 5750.0
*Surface, Name=Bridge-Surf, Type=Element
 Bridge-Elements, SPOS
*Surface, Name=Vehicle-Wheel, Type=Node
 Vehicle-B
*Surface Interaction, Name=Int-1
*Surface Behavior, Pressure-Overclosure=Hard
*Contact Pair, Interaction=Int-1
 Vehicle-Wheel, Bridge-Surf
*Equation
 2
 Vehicle-B, 1, 1.0, Vehicle-T, 1, -1.0
*Amplitude, Name=Move, Time=Step Time
 0.0, 0.0, 0.9, 25.0
*Boundary
 Bridge-L, 1, 2
 Bridge-R, 2, 2
 Vehicle-T, 1, 6
********************** Self Loading Step ************************
*Step
*Static
 0.1, 1.0
*Cload
 Vehicle-B, 2, -56407.5
*Output, Field, Frequency=1
*Node Output
 U, RF, CF
*Output, History, Variables=Preselect
*End Step
********************** Dynamic Step ************************
*Step, Inc=100000
*Dynamic, Alpha=-0.05, Application=Transient Fidelity, Haftol=5500.0
 0.001, 0.9, 1.0E-7, 0.001
*Boundary, OP=New
 Bridge-L, 1, 2, 0.0
 Bridge-R, 2, 2, 0.0
*Boundary, OP=New, Amplitude=Move
 Vehicle-T, 1, 1, 1.0
*Output, Field, Frequency=1
*Node Output
 U, RF, CF, V, A
*Output, History, Variables=Preselect
*End Step

------

The world started with 0, is progressing with 0, but doesn't want 0.