TIMS showedSmoke Internal at Rear M2.Staff(YCK) checked and confirmed no signs of smoke / fire / burning smell on exterior or interior of train. Train was es corted to terminal station. ~~~~~ 3557 - TIMS showed  Smoke Internal at Rear M2(2558) .Staff(YCK) checked and confirmed no signs of smoke / fire /burning smell on exterior or interior of train. Train was escorted to terminal station.  At car 2558, on TIMS found FC 720, 731, 735. Removed internal smoke detector sensor to clean and service with compressed air. Secured the smoke detector sensor back and function tested. Monitored no futher false triggering of smoke detector alarm. DOne by: Saini/Asruddin 45172