箱根登山鉄道 箱根湯本 Hakone Tozan Railway (4/10) to Hakone-yumoto について・・・
From Iriuda stop to Hakone-yumoto
terminal, Hakone Tozan Railway,
(operated by Odakyu Electric Railway.)
In this section, you can see Three-rail dual gauge track system.
(about dual gauge...
http://en.wikipedia.org/wiki/Dual_gauge )
From Odawara to Hakone-yumoto, now only OER's cars are used.
OER's of cars and HTR's cars size are different.
Then in the past, OER and HTR used Three-rail dual gauge track system for OER linked up with HTR from Odawara to Hakone-yumoto.
Now from Odawara to Iriuda, they removed the system.
(the detail of circumstances is explained on
http://www.youtube.com/watch?v=2T1KbZUgc7E)
However, at Iriuda, HTR was yard then still the system remained from Iriuda to Hakone-yumoto.
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