U.S. intelligence agencies monitored the canister ejection test of a DF-41 missile from a rail-mobile launcher on December 5, 2015,  at the Wuzhai missile test center, also known as the Taiyuan satellite launch centre in Shanxi Province. US officials say this test 'marks a significant milestone for Chinese strategic weapons developers and demonstrates that Beijing is moving ahead with building and deploying the DF-41 on difficult-to-locate rail cars, in addition to previously-known road-mobile launchers.'  Phillip A. Karber, a defense expert who heads the Potomac Foundation, said his organization recently identified a DF-41 at a special launch site at Taiyuan. He said “If that missile train hosts the DF-41 ICBM it means it will also have a MIRV potential. The combination of high-speed mobility, launch cars disguised as civilian passenger trains, tunnel protection and secure reloading of missiles, coupled with multiple warheads, makes the system extremely hard to regulate or verify the number of systems.”