BLACKWATCH
Mechanical Engineer
You are the only person I know of, that has less knowledge than Pooh Bear. lol
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Normally because they are too tall. Many preserved locos have had several inches chopped off the top in order for them to be allowed on the mainline...Why would they be banned from working under overhead wires though?
You can fit a much larger boiler and firebox on as there are no driving axles on the central frame to get in the way.
The theory is that in the event of the main coupling breaking (due to metal fatigue or what have you), the other two couplings would hold the train together until it could be stopped safely. The three coupling chains were found on fast passenger locomotives and coaches.Pray explain, why does the Stirling Single have three (I presume coupling) chains?