After all 4 units had been assembled, the trestles were removed and the whole underframe gently slid down the suspension to it's proper level. We couldn't believe how well everything went together and how easily the whole assmbly rolled along the track. the wooden boards are temporary tie bars that will enable me to measure and dsign the real ones as well as check all the clearances for the 4 stays that go across from the tie bars to the opposite solebar.