The document summarizes an experiment conducted to investigate the performance of LTE systems for high-speed trains carrying massive numbers of onboard users. The experiment tested handover latency and throughput reduction as the number of users increased from 16 to 120. Results showed that handover latency increased exponentially, reaching 1 second for 120 users traveling at 300km/h. Throughput also decreased with higher user numbers. The experimental setup isolated Doppler effects to specifically measure the impact of frequent handovers due to high speed travel.