Divot/Arch for Wooden Train Track Bridge Clearance

The taller trains sometimes get stuck under bridges, so this piece of track provides a little dip to give them clearance (~2 mm seems to be enough for all of my children's trains) while still laying flat on the floor. It can also be flipped and used as the crossing piece for a bridge, making an arch and providing extra clearance underneath. For extra tall trains, use it both as the bridge and the underpass for a combined 4.4 mm extra clearance (sounds small, but it does the trick).