opengl synopsis for train moving

void TRAINS(int x1,int y1,int a,int b)
{
int i=0; glBegin(GL_QUADS);
glColor3f(0,0.0,1.0); //ENGINE
glVertex2f(x1,y1); //lengh of engine=60;height of engine=30;
glColor3f(0,0.0,1.0);
glVertex2f(x1+60,y1);
glColor3f(1.0,0.0,0.0);
glVertex2f(x1+60,y1-30);
glColor3f(0,0.0,0.0);
glVertex2f(x1,y1-30);
glEnd();
while(i<3) {
glBegin(GL_QUADS); //BOGIES
glColor3f(1.0,0.0,0.0); //For right train a=795,b=510
glVertex2f(a,b);
glColor3f(1.0,0.0,0.0);
glVertex2f(a+60,b);
glColor3f(1.0,0.0,0.0);
glVertex2f(a+60,b-20);
glColor3f(1.0,0.0,0.0);
glVertex2f(a,b-20);
glEnd();
a+=65; i++;
}
}