"David Bennetts" wrote:

Have you noticed that most narrow gauge rolling stock is narrow, whereas DLR
is quite wide. If you have wide stock on narrow gauge tracks, there is a
potential problem with stability.


In Britain we use narrow gauge rolling stock on standard gauge track.
The rolling stock on metre gauge railways in mainland Europe is often
wider than Britain's main line stock, and their main line stock
running on standard gauge is much wider.

British standard gauge rolling stock functions perfectly well on 3' 6"
gauge railways in New Zealand and other countries.