Arthur Figgis wrote:
On 28/07/2015 16:41, Recliner wrote:

Given its twisty, highly graded route, and modest speeds, metre gauge
tracks might well have been more appropriate. There are plenty of metre
gauge railways and tramways in Europe and Asia, so standard kit should
readily be available.

Generally in the form of slimmed-down and lower-capacity "normal"
vehicles. AIUI modern trams come in two standard-ish widths, 2.65 m and
2.3 m, though there are many exceptions on legacy lines which need
something different. If you can get away with the lower capacity of
smaller vehicles, do you need light rail in the first place? If your
stock is going to be full-size, why bother with narrow gauge?

The DLR vehicles are 2.65m. Narrow gauge is better on lines with tight
curves, like the DLR.