Nowadays, the trains play vital role in the transportation of lot of people. So, it has to ensure their safety by checking of their parts frequently. On those, the inspection of pneumatic brake cylinder of trains after overhauling is very essential to check the extraction and retraction of the cylinder in correct dimension and rotation of the ratchet in the cylinder. Then only, they can involve in the braking operation effectively. But, the increasing of train brake cylinder in recent days takes more time to check them manually. So, it needs to find the new way to inspect the brake cylinder. In this project, the mechatronics system which is implemented to inspect the brake cylinder is explained detail. The mechatronics system is the new way and also the effective way to inspect air brake cylinder of the trains after overhauling and reassembling them.