The BÜ signal (type 1958) has two signal levels. The lower light is orange and always on. The upper one is white and flashes when the level crossing is safe and the train is allowed to continue. In the prototype this signal is set up on both sides of the railroad crossing.

You can make the lenses with the help of Kristal Klear. The kit includes the signal produced in the 3D printing process,
2 wired LEDs, resistors, protection diodes, a printed mast shield and a construction manual.

Dimensions: 4.5 x 7.5 x 33.7mm

The highly detailed parts are made of resin in the 3D printing process and are delivered unpainted. The accessories can be processed and painted with standard tools and colors (eg with Revell Email or Revell Aqua Color)
At Youtube there is a video with the working signal.