16-16  Basic Statistics on National Railways in Operation
Item	1985	1990	1995	2000	2005	2010	2011
Length of Railways in Operation                (km)	52119	53378	54616	58656	62200	66239	66050
In Formal Operation	49433	50310	50866	51262	57589	64537	65488
In Temporary Operation	2686	3068	3750	7394	4611	1702	562
Proportion of the Length in Formal Operation	94.8	94.3	93.1	87.4	92.6	97.4	99.1
Double-Tracking Length                             (km)	9989	13024	16909	21408	24497	29684	29884
As Percentage of the Length of Railways	19.2	24.4	31.0	36.5	39.4	44.8	45.2
in Operation
Length of Electrified Railways                   (km)	4151	6941	9703	14864	19408	32717	34330
As Percentage of Railways in Operation	8.0	13.0	17.8	25.3	31.2	49.4	52.0
Length of Diesel Engine Routes                 (km)	10822	16097	24749	39497	42792	33522	31719
As Percentage of Railways in Operation	20.8	30.2	45.3	67.3	68.8	50.6	48.0
Length under Centralized Traffic Control (km)	1307	1169	1226	1200	1828	17977	14821
Automatic Blocking Length                         (km)	6921	10370	12910	18318	24149	37500	34175
Semi-automatic Blocking Length               (km)	42625	38832	40859	41695	39390	37468	38270
Length of Continuous Welded Rail            (km)	10439	14644	21854	29975	47965	62954	75400
Relay Interlocking Station                          (unit)						3065	2814
As Percentage of Stations in Operation						51.4	54.1
Computer Interlocking Station                  (unit)						2792	2601
As Percentage of Stations in Operation						46.9	50.0