Instead of buying direct from Heckl Kleinserien, I got several of their products from Scholz, one of the gorgeous is the "Flying Hamburger"

note the paint damage of the top stripe need the cab due to the transportation.  I might have to ask them to send a small bottom of paint to let me fix it because it is very difficult to mix the pigment to match the original color......

Base on this historical zug, they have also launched another version lately  : the Rhein Main

The limitation of the radius is stated in the packing due to the length of the zug and the running direction is also indicated on the bottom of the zug.