To give a realistic appearance to the front of the train, we tried some clear stickers. The look closely matches the original train, and there are many destination sign combinations possible. So many actually, that we might have to reduce the number to make it easier to place. Right now it requires two pieces, which are quite small.
On the left is a train without the sticker (with just some small amount of black and white to better blend the sticker), and on the right a train with the sticker.