. Official proceedings . -. a Supposing a car with a superimposed load in passing asharp curve at a high speed, is just on the point of tilting on therail, and if the side bearing is in line between the rail and centreof gravity (See Fig. i), the car with its load and truck will tiltas a whole. The Side and Centre Bearings of a Car. 13 Should the side bearings be located inside this line (See ), it is clear that the body would have tilted on it sooner; inother words, the stability of the car towards tilting is not asgreat as in Fig. i. Reversing the case and locating the side bearings out
. Official proceedings . -. a Supposing a car with a superimposed load in passing asharp curve at a high speed, is just on the point of tilting on therail, and if the side bearing is in line between the rail and centreof gravity (See Fig. i), the car with its load and truck will tiltas a whole. The Side and Centre Bearings of a Car. 13 Should the side bearings be located inside this line (See ), it is clear that the body would have tilted on it sooner; inother words, the stability of the car towards tilting is not asgreat as in Fig. i. Reversing the case and locating the side bearings outsidethe line in question (See Fig. 3), the stability against tilting isa maximum, the same as in Fig. i, but new conditions arisewhich are detrimental in other directions. For instance, a stiflfcar in passing a very uneven track may cause the load to bearexclusively upon one side bearing and, the outside wheel form-ing a fulcrum, cause the inside wheel to climb the rail. This hashappened in actual service more than The reason passenger trucks with outside bearings do notprove out what has just now been said, is that the cars are longand flexible, and that they have a large motion of springs, usingequalizer and bolster springs in tandem. 14 Proceedings Railway Club of Pittsl:)nrgh. In case of a flat or gondola car with an ordinary load, i. e.,with a lower centre of gravity, it is self-evident that we couldmove the side bearings inward, but it is equally self-evident thatwe should provide for the worst cases. For this reason a one-sided load must be considered, whichnaturally calls for a greater spread than the central loads abovementioned, but the method of determining the correct location isjust the same, and the whole question resolves itself into one ofloading. Suggestions have been made not very long ago to determinethe correct location by having a car loaded with wheels, and torun it at different speeds. This would be an unfortunate under-taking. In the first place,
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