Qiang, J. Ding, Y. Emma, P. Huang, Z. Marcus, G. Mitchell, C.E. Nosochkov, Y. Papadopoulos, C. F. Raubenheimer, T.O. Venturini, M. Wang, L. Woodley, M. Start-to-End Simulation of the LCLS-II Beam Delivery System with Real Number of Electrons WEP070 FEL emittance linac electron simulation 2015 2015-12 The LCLS-II as a next generation high repetition rate FEL based X-ray light source will enable significant scientific discoveries. In this paper, we report on the progress in the design of the accelerator beam delivery system through start-to-end simulations. We will present simulation results for three cases, 20 pC, 100 pC and 300 pC that are transported through the hard X-ray line and the soft X-ray line for FEL radiation.