Experiments are being carried out in short wave transmission on the Sundsvall-Trondheim line cutting through the Scandinavian peninsula For the improvement and acceleration of traffic a number of trains have been equipped with radio apparatus. The transmitter is located in the guard's van and the receiver is in the driver's cabin. By this means the guard is able to communicate information to the driver who, in his turn, sififües by siren according to code whether he has understood the message. In view of the noise on the footplate of the engine, it has not be found practical to use two-way communication by microphone.
Text read from the printed page and cleaned; old type leaves the occasional error.