TIMS showed Smoke Internal at car 3504.Staff(AMK) checked and confirmed no signs of smoke / fire / burning smell on exterior or interior of train. Train was es corted to terminal station. TIMS showed Smoke Internal at ca ~~~~~ 3504 TIMS showed Smoke Internal. Staff(AMK) confirmed no signs of smoke/fire/burning smell on exterior or interior of train. Train was escorted to terminal station. CE : 3504 smoke internal alarm reset ok n no abnormality found.  3504 FC720 smoke internal. Checked no.1 end smoke detector no signs of dust/water ingress. Replaced relay(SDR1) with new spare. Ops20 raised to check no.1 end internal smoke detector.  Kiran 45281 BSD: To check no.1 end smoke detector