Sketch

#include <CapacitiveSensor.h>

long time = 0;
int state = HIGH;

boolean yes;
boolean previous = false;

int debounce = 200;

CapacitiveSensor   cs_6_4 = CapacitiveSensor(6,4);
// 10 MegOhm resistor between 6 and 4, 4 is the sensor.

void setup() 
{
  //Set pin assignments
  pinMode(2, OUTPUT);
  pinMode(2, OUTPUT);
  pinMode(3, OUTPUT);
  pinMode(4, INPUT);
  Serial.begin(9600);
}

void loop() 
{
  long totall =  cs_6_4.capacitiveSensor(30);
  
  if (totall > 60){yes = true;}
  else {yes = false;}
  
  if(yes == true && previous == false &&millis() - time>debounce)
  
  {
  
  //Ring the Bell!
  
  digitalWrite(2, HIGH);
  delay (300);
  digitalWrite(2, LOW);
  delay (400);
  digitalWrite(2, HIGH);
  delay (300);
  digitalWrite(2, LOW);
  delay (400);
  digitalWrite(2, HIGH);
  delay (300);
  digitalWrite(2, LOW);
  
  //Press and hold accelerate button.
  
  digitalWrite(3, HIGH);
  delay (5000);
  digitalWrite(3, LOW);
  
  //Wait for the train to roll for a bit.
  
  delay (35000);
  
  //Press and hold the decelerate button.
  
  digitalWrite(4, HIGH);
  delay (7000);
  digitalWrite(4, LOW);
  
  //Ring the bell again!!
  
  digitalWrite(2, HIGH);
  delay(300);
  digitalWrite(2, LOW);
  delay(400);
  digitalWrite(2, HIGH);
  delay(300);
  digitalWrite(2, LOW);
  delay(500);  
}
}