This　paper　outlines　an　experimental　and　numerical　hybrid　analysis　of　dynamic　responses　generated　by　train　traffic　loading　in　an　urban　metro　tunnel.　It　presents　a　set　of　measurements　of　the　wheel　loads,　track　bed　vi-brations　and　pore　pressures　right　below　the　tunnel　to　describe　the　excitation　induced　by　train　traffic　loading　and　the　propagation　of　dynamic　responses　in　the　railway　system　and　surrounding　soil.　A　key　aim　of　this　paper　is　to　provide　a　set　of　dynamic　response　records　that　researchers　can　use　for　further　investigation　and　the　validation　of　numerical　prediction　models.　The　experimental　analysis　of　vibration　responses　reveals　that　the　resonance　fre-quency　of　the　track　system　(P2　resonance　frequency)　of　64　Hz　in　monolithic　track　bed　coincides　with　the　fre-quency　where　the　largest　track　bed　vibration　occurs.　There　are　residual　pore　pressures　in　some　surrounding　saturated　soil　during　and　after　train　passages,　and　the　amplitudes　of　residual　pore　pressure　grow　with　the　train　speeds.　The　serial　number　of　the　vehicles　corresponding　to　the　maximum　excess　pore　pressure　is　relative　to　the　train　speed.　The　numerical　analysis　reveals　that　the　extent　of　excess　pore　pressure　build-up　in　tunnel　surrounding　soil　during　train　passage　is　also　determined　by　the　ratio　of　train　speed　c　and　the　soil　Darcy　permeability　kD.　For　a　tunnel　buried　at　a　deep　depth　like　nearly　20　m,　the　shear　stress　is　too　small　to　excite　the　rotation　of　principal　stress.　The　increase　value　of　c/kD　brings　small　but　adverse　implications　in　terms　of　the　potential　for　soil　failure.　For　the　tunnel　substratum　soil,　the　initial　stress　state　(i.e.　K0)　is　a　more　dominant　factor　to　determine　the　like-lihood　of　failure　than　underground　train　traffic　load.