The Double Cloverleaf is an extended version of a normal Cloverleaf junction. This junction use tunnels instead of bridges, because tunnels don't have speed limits. As you can see on the image below, there are two tracks leading into the junction and two leading out: the whole reason for a double cloverleaf is to allow more traffic to flow through your line if you have a 4 track mainline.
- Double tracked, holds twice the number of trains
- Can handle a large number of trains at the same time.
- Uses separate tracks so trains wont interfere with each other too much.
- Branching after merging: Very likely to enter a deadlock state.
- Extremely large
- Trains have to slow down when climbing a slope
- Trains have to turn right to turn left. This could lead to trains getting lost. (Can be fixed using waypoints)
- Doesn't have a direct path so that trains travel extra far to turn left.
- Costly to build
- Difficult layout to remember and to build