TIMS showed Smoke Internal at Rear M2 car . Staff(AMK) checked and confirmed no signs of smoke / fir e / burning smell on exterior or interior of train. Train wa s escorted to terminal station. ~~~~~ TIMS showed Smoke Internal at 2521 car . Staff(AMK) checked and confirmed no signs of smoke / fire / burning smell on exterior or interior of train. Train was escorted to terminal station. CE: 2521 internal smoke 1 alarm reset monitored ok  Check the above mention reported FC720. Service,clean by air compress blow smoke sensor done due to dust and Functional tested okay. Security check and monitor ok. Done by Saini/Asruddin 45435