. Official proceedings . eto derail. With steel bolsters we are very much better off, knowingthat they deflect much less, and in accordance with action of theM. C. B. Association taken some years ago it is considered safeto have ^ per side, while on the other hand it was decided notto go above 5-16, so as not to get too much lateral motion. This question has also enjoyed a good deal of attention fromindividual parties, judging from the many patents taken out for The Side antl Centre JJearino-s of a Car. ir adjustable side bearings. These were principally constructed sothat by taking up another
. Official proceedings . eto derail. With steel bolsters we are very much better off, knowingthat they deflect much less, and in accordance with action of theM. C. B. Association taken some years ago it is considered safeto have ^ per side, while on the other hand it was decided notto go above 5-16, so as not to get too much lateral motion. This question has also enjoyed a good deal of attention fromindividual parties, judging from the many patents taken out for The Side antl Centre JJearino-s of a Car. ir adjustable side bearings. These were principally constructed sothat by taking up another notch or tightening up a bolt, the sidebearing could be increased or decreased in thickness, but the ad-ditional complications of such devices undoubtedly were againsttheir introduction, at any rate they did not meet with favor. Thenearest approach to this principle is a truck side bearing whichfits loosely in a socket and which is supported by a wooden blockin the bottom of the socket. This block can be made of the re-. quired thickness, thus making the side bearings actually adjust-able in height. This form of side bearing is successfully used onseveral roads. Spread of the Side Bearings. Another question often discussed is the spread of the sidebearings. Most of them are located 30 from the centre, a goodmany 25 and others as much as 48. In this last case they are 12 Proceedings Railway Club of Pittsburgh. located ouside of the arch bars or wheel pieces. The reason forspreading them as far as possible has already been mentionedabove, namely, to reduce the rolling of the car; but there arejust as good reasons to keep them as near the centre as possiblein order to reduce the friction against swivelling the truck, andwe are again confronted by the same problem, to get a steady rid-ing car and a freely swivelling truck. However, the correct spread of the side bearing is not amatter of mere preference or individual judgment; it is rigidlydefined by the centre of gravity of a car
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