Ślizg boczny sprężynowy do wózków 25TN oraz 26 TN. - http://www.triton-kolej.pl/pl/oferta/slizg-boczny-sprezynowy

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Side bearer to the 25TN and 26TN bogies - http://www.triton-kolej.pl/en/offer/side-bearer-and-componen...

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Note added at 34 mins (2016-11-06 11:13:24 GMT)
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Side Bearer - The two bogie side bearers are fitted at a distance of 1940 mm and 970mm from the center of the bogie. The bogie side bearer is welded along its length of top plate on the bolster 12 mm thick. At the location of side bearer, the bolster plate has been strengthened from below. Different types of side bearers used in CASNUB bogie are - Roller type bearer housed in cast iron steel housing riveted on the bogie bolster, Constant contact type rubber pads & Helical spring side bearer. The main funtion of side bearer - Oscillations are developed due to unevenness of the track as a consequence of this bolster also oscillates. During oscillations load is eccentric. And this eccentric load is taken by side bearers. Bogie while negotiating curve rotates about pivot pin, therefore side bearers provides smooth rotation bogie in horizontal plane. - http://www.traintrackers.com/misc/casnub.html