Help with LEDs on model railway project

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Sorry for the delay in answering. No idea so far what rises the problem...

Just a suggestion to try :

  • Remove the lines that handle the display from loop()
  • Add the following function and the modification to HandleModelClock() to your sketch
// Copy this function to your sketch; maybe just before HandleModelClock();
// so that it is close to where it is used
void PrintModelClockToDisplay()
 {
     display.setBrightness(1,true);
     display.showNumberDecEx(modelClock.minutes, 0, true, 2, 2);
     display.showNumberDecEx(modelClock.hours, 0x40, true, 2, 0);
}

void HandleModelClock() {
  if (currentTime - modelClock.stamp >= modelClock.duration) {
    modelClock.stamp = currentTime;
    modelClock.seconds++;
    modelClock.seconds %= 60;
    if (!modelClock.seconds) {
      modelClock.minutes++;
      modelClock.minutes %= 60;
      if (!modelClock.minutes){
        modelClock.hours++;
        modelClock.hours %= 24;
      }
    }
    PrintModelClockToSerial();
    PrintModelClockToDisplay();  // Add the new function here !
    HandleCountDown();
  }
}

You might also add a static or global variable to HandleModelClock() that checks when the minutes have changed and call the display function only in that case ...