Diskussion:SBB Ae 3/6 II
Der mechanische Teil[Quelltext bearbeiten]
Excuse me for writing this in English (I am Norwegian, and try to read the German article by Google translation and try a little with the original). Also excuse my locomotive terminology. I would not mind if anybody translated this comment.
The chapter "Der mechanische Teil" states that because there is only one transformer and two motors, the locomotive got the 2'C1' asymmetric wheel arrangement. To which degree is this correct? I have read that the front 2 axles were also there to tackle the curves better, and run smoother? This seems to have been used throughout locomotive history. This is also stated in a Swedish article [1] about the Swedish D locomotive [2], where it is also stated that its designers went to Switzerland in the early twenties to study the new locomotivie there. From that chapter [3] I assume this was the new SBB Ae 3/6 II. It was seen that it went equally well in both directions, so the Swedes made the D model as 1'C1' (2-6-2). I think it was designed for lower speed. The Swedish locomotive also had only one transformer, but that design did not need the front two axles. So one transformer does not necessarily lead to two front axles. Both locomotives had two motors of about equal power each, both one transformer each. (Also note two external driving axles on the Ae 3/6 II but one on the D-series, and both have three driven axles.)
Since the Swedish locomotive only has one driving axle and three driven axles (two driven on one side and one driven on the other side of the single driving axle), there is an asymmetry there, that Ae 3/6 II does not have (one driven, one driving, one driven, one driving, one driven). This of course would have helped in finding a place to mount the transformer in the D-series. I don't know where the transformer is in the Swedish locomotive, but assume it is above the one of two axles that is closest to the end.
This perhaps points to two reasons for the Ae 3/6 II bogies?
[1] - (Swedish) http://www.nyteknik.se/nyheter/fordon_motor/jarnvag/article3282181.ece
[2] - (English) http://en.wikipedia.org/wiki/SJ_D
[3] - (Swedish) "Ändå gjordes en studieresa till Schweiz, där man tagit i drift ett lok med tre drivaxlar och koppelstångsdrift samt löphjulsboggie i ena änden och en löpaxel i den andra. Här fanns chansen att studera båda löphjulslösningarna i ett och samma lok. Vid hastigheten 100 km/h gick loket lika jämnt i båda körriktningarna, och SJ:s representanter kunde känna sig nöjda med valet att enbart använda löpaxel på det kommande svenska loket."