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Mass rapid transit (MRT) technology had gone through a very comprehensive and intensive evolution in recent decades. Those developments and innovations occurred in both technological and engineering aspects. In this project, a laboratory-scaled mass rapid transit system based on Programmable Logic Controller (PLC) is built. The motivation of this project is to design and develop a laboratory scaled mass rapid transit system that can demonstrate the operation of a real MRT system to the public. Omron CJ2M series PLC, Shihlin Electric Human-machine-interface EU200 series, Lego 7938 City Train Set and Arduino microcontroller board are used to develop the system. Several NPN sensors are implemented in the system to perform the automated operation of a real MRT system. Other devices such as servo motor, light-emitting diode and DC motor are used to support the primary function of the rail system. In addition, simulation software in controlling the operation of an MRT system is also developed. The outcome has significantly contributed towards in depth knowledge and practical understanding of mechatronic system development and implementation.