What effect will the use of sandboxes during start-up on slippery rails trigger?
Show the correct answer
Correct answer
A. Facilitates start-up - reduce wheel slip.
Explanation
The question is about using the sanders when moving off on slippery rails. Sand will make starting easier because it will reduce wheel slip - answer A.
The sander drops sand in front of the wheels, between the wheel and the rail. The grains increase friction, so the wheels transfer the driving force to the rails better and do not spin on the spot. The claim that sand will make starting harder (answer B) or will not affect it (answer C) contradicts the purpose of this device. You use the sander sensibly - only when the rails are slippery, for example wet, icy or covered with leaves, because too much sand makes the tram tracks and the points dirty.
Legal basis: § 16 para. 2 of the Regulation of the Minister of Infrastructure of 2 March 2011 on the technical conditions of trams and trolleybuses and the scope of their necessary equipment (Dz.U. nr 65 poz. 344); Art. 3 para. 1 of the Road Traffic Act (Prawo o ruchu drogowym)