Building a long permanent magnet for a Maglev train system is technically feasible. The concept involves using a series of permanent magnets arranged to create a magnetic field that can support and propel the train. Advances in materials and engineering could enable the construction of a 10-kilometer-long permanent magnet track. However, practical challenges such as cost, maintenance, and magnetic field uniformity must be addressed. Overall, the idea presents an innovative approach to Maglev technology.